Sitting in the secondary for 3 months should be a much better option than sitting in the primary for that length... I would expect trub to be 50%-80% less in that environment, thus less risk of autolosys.
Ideally you would wait 2 weeks then transfer to secondary and age for that long, but since their isn't an ideal alternative for you, this is at least less risky. (Unless you really were going to have your SWMBO rack it)
I'd think of it as, "bulk aging" on a little bit of trub. Some risk exists for autolosys and offflavors anytime you are sitting on trub for that long (which is why normally if you planned to bulk age you would secondary only after maybe 2 weeks or more), but I'd much rather it sit on 1/2" of trub/yeast cake than 1 1/2"-2" of trub/yeast cake as it would in that primary.