Again the problem with communities paying into the systems are as follows
(1) who pays, You cannot force anyone to pay, How can you force a Reform jew who lives in the area to pay or a Satmar to pay for a Zionist Yeshiva
(2) If a parent pays as a community member and their kid is “undesireable” can the yeshiva kick them out? You cant take peoples money and not expect an education for the kids.
(3) what if somones financial situation changes, Are you going to check everyones Taxz returns and decide how much to charge them