You beat me to the solution Torquinox which I tend to use a lot.

Many items just don't play well when they are "Fitted" to the Character. Eyeglasses and shoes/boots are frequently the culprits it seems. So regard them as Props, so only Parent (which you can do as the last step with Parent in Place), and no Fitting to the Character. Then translational changes such as Scale, Position, etc. affect just the glasses. Morphs on older items for me have always been "iffy", so test to see if they're usable.

Ironically, I'm having almost no issue with this sort of thing with G9 wardrobe on G8-8.1 characters.