Arctic shields are a pain to put on using a predator, I don't think it is possible on anything smaller tbh. I may find out this year, or, if my PXL shows up I may have extra room...They do keep feet warm, but are noisy on the predator if you are bot careful. I bought a set of electric insoles last year and they were more than enough down through negative two. Also, the Hothands insoles are amazing, assuming you can get them before they are gone for the season.
-Chuck