if you think you should get every users to give themselves headaches by using fake ID, that will just get them into even more trouble

the actual solution is much much much more simple

stop calling and advertising a certain feature as a "mixer"
much like uber doesnt call itself a taxicab company to avoid taxicab regulations

start creating and using something called.. for instance "property rights protection tool"
where the function is similar to what you want. but where its protected by actual property rights laws

yep property rights laws are stronger and have existed for centuries
however privacy laws are modern and dont apply to economics. so trying to hit your head against a hard rock trying to scream for financial privacy is a weak defence.

it truly does pay to do research, learn things and not just reply on the buddy speak of ignorant people