Oh, my dear good woman! what an ordeal you have been through! I wish we were neighbors as Hubs is a wizard at building and creating solutions to making things go easier. I so hope you will be WB again soon, NWB it is such a nuisance. I am so sorry you had this accident.
when I have been casted it does indeed throw off everything from hips, shoulders and back. I had 10 knee surgeries of misc forms before my TKR’s and some casted, some braced, some immobilizers. Being in an Immobilizers and flying on an airplane is a particularly interesting test of sanity. And wrist/forearm casts, too. Yuck. They smelled particulary nasty, and I was dumb and by adding cologne just made them smell like really nasty rags that had been sprayed with bad cologne!
Anyway, my favorite choice of scratching tool I always used was a soft wooden or plastic long spoon or spatula. If wooden spoon, be sure to sand down the edges real smooth.. but the long narrow round end of those worked very nicely for the weird curves of lower leg. I had to be very, very gentle so not to hurt that tender thinning skin in the cast but it worked for me. Ahhhhhhhhh.
PS: I Like your Bike in your profile photo! I’m looking forward to getting mine dropped from the garage ceiling hangers and up on a trainer when I get the go-ahead.
Hope you can rest a bit easier soon- that first gentle wash after-cast will be soooooooo lovely!