sounds krazy, kat!
The way a SE bolt usually works is the outer "ring" screws into the dustcap threads and the inner (ROUND, not hex) bolt head has to rotate and press against that ring so the ring has to be pretty beefy. I don't think a modified TA dustcap would be up for that service, probably be ruined if not immediately then before too many cycles...and that defeats the whole idea (or at least some) of having a SE bolt, I'd think.
I'd stick to something with 22mm threading and use a commercially-made SE bolt/ring combo that has proved good.