Originally Posted by
ThermionicScott
I do like the previous suggestions of running a smaller big ring if that helps accomodate a chainguard. 46T and 48T rings in 110 BCD are easy to find, and your wife may not even notice the difference once you've readjusted the front derailleur.

€10 says she won't even notice, she'll get a better working by spinning and she'll be excited by the lack of grease. perhaps even going 50t to 48t and buying the SKS Chainboard would be the way to do it.
that's what i'd do for my gf ...