T for two...

[Jurassic Referee]

There's only two ways that you could possibly call this,IMO:
1)If you call the 2 T's "simultaneous technical fouls" as per 4-19-9,Team A would shoot their original bonus with the lanes clear,the FT's for the simultaneous T's would not be taken,and you'd go to to the AP.
2)Because of the time lag between the 2 T's,you decide that the two T's don't fit the definition of "simultaneous". You now take everything in order,but you count the 2 T's as being both parts of a false double foul as per R4-19-8.You now have a personal foul,FOLLOWED by a false double foul(made up of the 2 T's).You then administer everything in order that they occured.Thus, A finishes the original bonus,then A shoots 2 FT's for B's T,followed by B shooting 2 FT's for A's T,followed by B getting the ball at center because A's T happened last.

My personal preference is #2 because of the time lag between the T's and the fact that they're not really part of the same play.Also,if I remember right, there was a casebook play many,many moons ago that discussed a personal foul,followed by two more fouls-and they said that you considered the last two fouls as a false double foul by themselves.