I might go against the fold and recommend getting a custom bike with s and s couplers.

There was a framebuilder that used maybe 4-8 couplers and had a mini velo that fit in a briefcase. I can't find the website, but he used it for touring for years.

Frankly, if I was ever interested in triathlons (instead of being an oversedentary fatty), I would consider making my own bike...pr probably following the Patek framebuilder manual...or just hire someone to build it for me.

Come to think of it...I need to get back on my bike.