In essence what you are after is a chocolate unicorn (with golden hooves).
You want for you to all happily swan off down your local STI Clinic and have a test together? Perhaps all go in the same room at once to save time
. That is never going to happen, no WG would do that.
If you really want a BB MFF then just select some AW WGs who do BB, they're not all hideous skanks, and message them with your plan.
But perhaps don't ask such a silly question here (and it has been proven to be silly) to somehow seek validation. You won't get it. Despite your rationalisation of it, it is what it is, a BB punt with a WG which involves your other half (at least it's all above board in that regard).
The other thing you could try, and you would have a chance if your other half is reasonably hot, is to go on Tinder. I reckon you'd have a strong chance of success there.
Best of luck
.