Being a 'lazy' cook fermenting is one of the easiest ways to preserve scapes. I cut them smallish and ferment in salted brine. They can keep forever int he refrig.
I also chop some up into salads. Another easy peasy use for them.
Good chopped into eggs, too. Anything that wants some garlic, scapes will suffice.
The only caveat is that the tougher parts seem to stay tough. So best to use when young or only the softer, more supple parts.