Or even do outreach to the mixers and ask them for a collab and lower mixer rates or a piece of the cake at least and market the software as the holy grail of mixing and make a sweet looking GUI with flashy graphics, then say all this fancy stuff with two times more anonymity than any other mixer out there and almost untraceable transactions blabla
But if the whole point of this exercise is to minimise exposure to a possible bad actor or poor mixer, then outreach and collab isn't just asking the enemy to sleep with you, but tainting the whole jar of milk, no?
Of course, as OP points out, using a mixer is all based on trust, after all. So I suppose if you could mark all the mixers you trust as safe for co-mixing in one melting pot, it does sound like something different.
In a practical sense, I'm sure a lot of people already achieve that... mixing, passing coins through exchanges, casinos, trading P2P...