I think that a 10% tithe would never happen. In fact, they could use that as an example of tge heavy handedness of the churches of Christendom.
However, they could point out that regular, planned giving could help the society plan in advance for expansion and also lovingly help the brothers to fit donations into their budget.
Once a year, just sit down and "count the cost" and make a pledge for monthly giving based on what they could afford. Each household would be given a form with their pledge amount declared and sent back to the congregation to keep on record. They could even be given sealable envelopes so the donations would be able to be tracked to the family.
This has the advantage of still feeling the amount is voluntary to the JW and for the Org, they get pledged donations on a regular basis.
This is exactly how my MILs Catholic church does it, down to the "anonymous" envelopes.
And this could all be spun as a loving blessing from Jehovah.
10%, no. Planned, regular donations, yes, I can see that coming.