Biting need replacement

First, I'm not diagnosed yet. I have the test on the 22nd of this month. I'm in my 30s and started asking my mom if it was possible in 5th grade but she just laughed at me. It's totally possible this isn't an autism thing but I think posting here works regardless (hopefully.) When I'm overly stressed I bite my arms hard. I don't actually hate it (I used to hit myself in the head which I didn't like) but others around me are not fans. I've gotten the chew jewelry but the issue is that I don't need the biting, I need the pressure on my arms. I used to dig my nails in which worked fine but I've got arthritis in my hands and don't have the strength. I have a little ouchies too which I like but again I can't push it against my arms hard enough. It's wild but I was thinking some sort of tong situation with spikes? If anyone has ideas I'd appreciate it. I know there are a good number of "stim option" posts so I apologize for another but I couldn't find anything for my specific ask. Thanks!