No worries.
I haven't experienced chafing with a BP (I did with a BC, but I'm convinced that it didn't fit properly). That said, I can see where it would be worrisome. And there is no doubt that a TPII is a very nice unit.
I wholly agree about the BC's you describe. I'd purchase a TP long before I bought a traditional BC.
As for no ditchable weight, I have no concern on this issue. Even in the Carribean, I always carry at least one lift bag; therefore, I always have at least one source of alternate lift and can ascend even if I lose my lift bladder.
Besides, I've never been a real fan of the emergency buoyant ascent, except as a nice way to win a DAN-paid chamber ride. As my current instructor and dive buddy puts it, "make a buoyant ascent, create an emergency".
I dive double 104's specifically because they don't require weight. This is accepted when diving doubles. So why not with singles?
In terms of ascending, the biggest difference between doubles and my 18 lb wing is that the Pioneer would be significantly easier to swim to the surface if I lost all sources of lift.