Wow! You have done well - all of you.
Guess what? No, guess again. Ok - here's my latest discovery that I am certain would help your boys.
I bought a weighted blanket, which is palliative for those with autism who experience sensory modality disorders. Some health insurance plans will (partly) offset the cost of weighted blankets too. Look on the Internet for weighted blankets, and why this is therapeutic. I ordered mine through www.weightedblanket.net 'Dream Catcher Blankets' from Montana but they ship to Alaska. I'm certain you would find something equivalent in Australia. Mine is handmade of my choice or print and weighs a 17 lbs! Actually, this is considered much too heavy for my size but I know, from experience, what works well. Tips: Try to not buy one made with navy beans, corn, rice, etc since this can degrade &/or attract insects or rodents (scary, but not an issue in Alaska). Sand (silica) can eventually sift through the fabric so find a blanket made with poly beads. The material should be machine washable (mine is).
Autistics like deep pressure and this is very calming. Much has been written about this, beginning with Dr. Temple Grandin - HFA autistic (like myself). She's an animals scientist and long ago was desiging a 'hug machine' for herself, like an animal chute, to offset her anxiety. It worked. Since then, much has been researched and documented about deep pressure in autistics - fascinating. Thank you for your update.
Separately, I mailed to KBABZ Russian Nesting Dolls from Alaska - he has received! Maybe this will help alleviate his loss somewhat.
Anyway, that's too much information but I am excited for you! You must have a fun household.
_________________
The ones who say “You can’t” and “You won’t” are probably the ones scared that you will. - Unknown