Bending the legs works fine. The ears are around 4.5mm too wide for the 707 route, so basically you have to bend them just over 2mm inward on each side. It's very easy to do this yourself with a pair of needle nose pliers. It's not tedious, it's very much a 20 second job.
If you're looking for pickup rings, standard size 7 string pickup rings will cover the route perfectly. You can buy those
here. You simply have to attach the rings into the route with longer screws, rather than into the face of the guitar, which would require you from drilling new screw holes there.
I should note, my 7 string bkp's are still coverless, until I get round to sending them in to have some fitted; so you may have to file the pickup rings slightly to accomodate the larger dimensions of the covers - haven't had chance to test this myself yet.