I'm afraid you might be over my head as I'm no bluetooth expert.
What's wrong with the built in solutions?
Is it that you don't like the software or that you find the connections lacking?
At first glance your wants seem a bit stingy as you want streamlined but are not happy with using the built ins you have or using the obvious slot available...
I was wondering myself if the communications daughter card slot the tc4200 uses is proprietary or some usually OEM only standardized thing which more upscale hardware might purchased for.
I didn't get the built in bluetooth with mine... and would really not mind too much just losing the modem if it came to that.
As I said... it is probably just beyond me... but... hey... you got a bump and maybe somebody who knows more about it will wander along.
Life ain't all bad...