Sorry to hear J. Keep us updated on your progress.
I'm back in regional Vic now and this is my outdoor rehab elastic setup. I've got 3 different strength elastics with handles and outdoor post anchors. Also got indoor door anchors. Except on days when I paddle my boogie I've been doing 2 sessions a day of the following.
Prescribed:
Carry dumbbell in each hand, special shrugging/shoulder blade movement followed by 5 steps, turn around, repeat the shrug and steps - twenty times. Actually all these exercies are done with that special shoulder blade control at the start.
Elastic rows,
Elastic presses ( rotating fists outwards and inwards).
Elastic external rotation.
Elastic internal rotation.
Dumbbell presses (recently introduced).
Extra stuff that my physio is happy with because it doesn't hurt.
Elastic face pulls (like on GromsDad's thread, but with back of hand facing me) - this is because it targets teres minor which is fed from the most damaged (rear) branch of my axillary nerve, although interesting this and the tricep came back way before the rear delt which also is from the same nerve branch).
Tricep elastic push downs.
Elastic pull overs.
Exercise ball one arm balancing (ball between legs - one arm on floor).
Exercise ball push ups - only a few reps at a time.
Non related hip flexor exercises using elastic bands not tubes - just to give me something to do and keep the whole body in shape.
Yoga triangle, reverse triangle and something else I don't know the name of as a more interesting exercise substitute for prescribed range of motion.
I'm in no rush to get back on the surfboard, just paddling the boogie is a relief and I've been able to get some whitewater standups which helps keep it more interesting. Maybe a month away from surfing, I'll see how it goes. I can do a reasonable motion of paddling where I lift my arm out of the water at the end of the stroke. If my nerve regeneration in my rear delt hadn't started then I'd probably end up giving up surfing - paddling would be too hard, but recovery seems to be quite steady there.