So I just stumbled upon https://github.com/deplinenoise/deluxe68 and thought it'd be a nice addition to rmac. I guess EQUR does something similar but a) it's restricted to the jriscs only, b) deluxe68 has many more cool features like register allocation/deallocation/renaming etc. I think it's neat anyway :)
Forgot to add: perhaps prefixing the named registers with some symbol (deluxe68 uses @) might be a good way to make parsing a little easier!