Ah, it looks similar to the RAT axles that were on my Cervelo. I had to replace the captive bit on the ~dropouts with a threaded replacements, which Robert Axle provided. Looks like they'd have to so something similar, here (though there may not be enough of them out there for them to bother?).
Do you already have a trainer? If not, this would be a good excuse to get a direct drive instead of a wheel-on trainer.