I think this would be acceptable as an alternative to normal backgrounds, but two things:
First, the original PCs didnt get this benefit, so I'll extend it to Lio now, if they're interested.
Second, feats need to be background appropriate and more flavor/fluff, as in the examples provided. Even the ones in Theros vary in gameplay/mechanical power (Alert,Lucky Mobile vs... Actor?) So please run em by me. Thanks!