Do you think it makes sense to prioritize vocab learning first, to feel comfortable speaking and listening, and then, after couple of years, catch up with reading and writing?
Currently I concentrate on vocabulary and learn kanji for each word. Studying all kanji readings makes no sense to me.
James Heisig has 3 books called 'Remembering the Kanji' the two of them are of interest to me: the 1st one concentrates on recognition (and writing maybe) and 2nd on reading.
I think James Heisig suggests vocab should be studied separately. Possibly it even makes sense to do hardcore vocab studying together with the 1st book, since these are so different activities. And when one feels confident he/she can bridge the gaps with the 'reading' book (the 2nd one).
This way also looks natural since children learn to speak first and write years later.
If yes, then maybe you could point to some materials that use this kind of program and can do 'kanjiless' vocab boosting.