[~Gullygirl~]

Do you mean using felt as an absorbent layer? Cos most of the felt squares you get from Lincraft etc are made from polyester, so not absorbent. Occasionally though you can get real wool felt squares though. but yes they would take forever to dry but if you are happy with that then that will work.
The idea of removing the wadding comes from the fact that the wadding is also non absorbent (I could be wrong, I think I have read this somewhere - mods please remove if I am wrong or this is innappropriate) so by replacing with something absorbent you get more out of the nappy yk?
Best of luck!