Today we accomplished "Stage 3.5". Keyshop offers are visible in user Wishlists (yay!), but with some limitations (two filters need to be disabled when keyshops are active).
This is just a temporary measure. Once we finish building stage 4 implementation, keyshops in wishlist will work as desired - with all filters available.
PS: If you need to access the two inactive filters, just disable the "include keyshops beta" switch. That way, you can use your Wishlist in the same way as before.