I don't understand why you're trying to learn individual characters by rote with all their possible pronunciations. In modern Chinese characters are words themselves or part of words, and those words are what carry meaning. Sure, in classical Chinese every character was a word in itself, and so every character will have at least one ancient meaning, such as in the example you gave, which you'll probably find in a huge dictionary like 漢語大詞典, but this is much like a study in etymology. Take 會 as another example. It has three pronunciations I'm aware of: hui4 as in c, kuai4 as in 會計 and even gui4 in an alternative pronunciation of the name of a place 會稽 (otherwise pronounced as "kuai4ji1"), but you only need to know all those three pronunciations if you know the words "meeting", "accountancy" and that archaic name place.
I can explain my system:
Please note that importing *all* readings was not my original plan, but instead the most common ones, like kTGHZ2013 in the Unihan data, but I have not found an authoritative list for traditional characters. In other words, all readings was what I got and I just rolled with it. I'd rather learn one too many than one too few.
The reason for this is quite simple. I have one Anki deck for characters, and one for vocabulary of two characters or more. It has saved me a lot of time. I have about 7500 words in my vocabulary deck by now and review are very quick. Please note that I already know the word 會計 and obviously the single character word 會, and that most characters I'm more
keeping fresh in my memory than actually learning them. This has boosted my reading ability a lot. It has helped me stop mixing characters, and realizing the reason I have been unsure of some readings is that I have not realized it was the *same* character (rare, but it happens). It also very quickly helps me learn most new vocabulary with almost zero effort, since I almost never run into new characters or new readings. It is also very good for surnames, which quite often are pronounced completely different from what one would expect of the character in question, like 蓋 (ge3).
But again, if I find a better filtering system, it would be nice. That's partly what I've been trying to achive lately. To take an extreme example: KEY has four readings and definitions of 厭. I say extreme because three of them are, I think at least, either archaic or "used as character XYZ", but I still know them all just because that was the system I had. II've had no problem remembering them, both readings and most common meanings of said reading. Now, I know that yan4 is the one I keep encountering, but since I'm not at an advanced level yet I can not make that judgement on all characters.
The 會 example also shows why I think KEY has the best definitions for individual characters:
Gui4
n (in this pronunciation used in certain place names, such as Guìjī 會稽/会稽 "Mount Guiji" [Zhèjiāng 浙江 Province])
hui4
v | n | sn 1 meeting 2 meet with 3 can, could 4 understand, know (like a language) 5 be able to 6 will, be likely to, be possible, possibly 7 moment, short while 8 Hui (surname)
kuai4
v | n | sn 1 calculate, add up 2 accounting 3 Kuai (surname)
It is also for my mental health... I hate reading books and encounter new characters I have to look up. To be completely prepared and not encounter too many new characters is a good feeling, especially if I not only know the character per se, but I know enough of it to understand how it functions in the sentence and what its reading probably is. Since I'm going to read a lot of 19th and 18th century material I've just made sure to learn the archaic ones as well until Ii find a better filtering system, since I'd rather get a few extra than miss a few.
If the Longman for example has fewer readings and have got rid of a lot of the archaic ones that would be a great filtering method. I tried using the Xiandai Guifan as a filter, but it's mising a lot of common characters because it's not made in that way (since it's not a character dictionary). Please not that this is exactly what I've been chasing both here and on Chinese-Forums, a good list of what readings are actually common! Not only *the most common ones*, for too many characters have several readings where two or more actually are quite common.
And I guess I'm not the first to say this, but... the characters are kind of fun. About 2500 characters in I still think that.
Should be fine since its mostly headwords?