Maybe you can hold the violin “guitar style” and pluck the strings. Can you use your left hand at all? This way you can work on fingering and tunes. Using a keyboard will help you to learn to hear pitches and rhythms. You can memorize tunes from a keyboard too. You will be practicing everything but muscle memory on the fiddle.
Reading the “Peak” book is something I’d like to fit into my schedule. Also sometimes I search to hear all the different ways a tune can be played. Happy healing.