Reddit reviews Handwriting for Heroes: Learn to Write with Your Non-Dominant Hand in Six Weeks. 3rd Ed.
We found 3 Reddit comments about Handwriting for Heroes: Learn to Write with Your Non-Dominant Hand in Six Weeks. 3rd Ed.. Here are the top ones, ranked by their Reddit score.
http://www.amazon.com/Handwriting-Heroes-Learn-Write-Non-Dominant/dp/1932690697
Here's a good book that might help.
Here is a book written for wounded vets:
http://www.amazon.com/Handwriting-Heroes-Learn-Write-Non-Dominant/dp/1932690697/ref=wl_it_dp_o_pC_S_nC?ie=UTF8&colid=2GMLLHM5EY7Y0&coliid=I1Y51YS4OQLROK
https://www.amazon.com/Handwriting-Heroes-Learn-Non-Dominant-Weeks/dp/1932690697?keywords=Handwriting+heroes&qid=1536754774&sr=8-1-spons&ref=sr_1_1_sspa&psc=1
This is a book for learning how to write with your non dominant hand. It might be useful, as after removing the cast, your hand might be weak.