I have noticed certain verbs seem to be related to earlier learned vocab but with different kanji and slightly different forms. I feel like instead of only creating mnemonics for these readings, it might be useful to also mention the words that they are related to which have related readings. Two examples off the top of my head are:
鎮める-しずめる-to appease or calm…I am at least 70 percent sure that this verb has some relation to 静か which was learned way early into wk and has the ideas of quiet and calm associated with it. So if you could mention that the reading for this verb is related to the meaning, that would make the reading one less thing to remember.
Another example, 偏る-かたよる to be biased …this has an alternative writing of 片寄る which could be mentioned and related to the reading since to approach something in a one sided way is literally what being biased is.
Anyway, I think there are a few others out there like this that the memorizing of their readings could be made easier by mentioning the roots that they are related to. Just an idea though.
EDIT- Also, if anyone can think of other examples, feel free to mention them below.