Changing GAT is not really an option and she has no interest in taking up cycling or tri. Which is great news for me.
There are no TT courses that are realistically close to me (I live in central London) so cant get to them. I think the nearest one (run by my cycle club) is around 20 miles from home. To get there involves 2 or 3 trains so not really practical for an early evening TT.
I'm quite happy with the idea that I will ride anything I want to do on the roadie, if I find someone from the cc happy to drive me and bike to the TT then i'll do it on that, maybe with clip on bars. The position is reasonably close to the TT back half, so it would be a small aero loss for a massive space gain.