It's hard to say what a minimal procedural language is. There are ISAs with a single instruction: https://en.wikipedia.org/wiki/One_instruction_set_computer

This looks like it's a MISC: https://en.wikipedia.org/wiki/Minimal_instruction_set_comput...

I've also invented something like this: NISC. (Or {}ISC) Null Instruction Set Computer. You can arbitrarily reduce the die size for implementations of this architecture, as well as scale the clock speed arbitrarily. It also revolutionizes cooling.