FE427TP
Yes, there is a market For a semi open bolt You just asking the wrong people, here everybody has a safe full of Auto Thompson.
You don’t have to go to a class 2 to get a bolt made, make or modify you own if you can.
I am very interested to see you design. I’m in the process of making a semi Suomi.
We can’t say since we don’t know what you have. Make it and summit it to the ATF Technical branch.
Tom