Have you considered using Nim? It's a great language that has some similarities to python and compiles to C code. It is a very convenient and powerful language to use, coming from Python.
Maybe I'm not understanding your use case well enough and maybe your approach is actually a locally optimal solution, and I honestly greatly respect your effort and want to see your project succeed, cuz I love Python too. I even wanted to make a faster python myself at some point. Just, the more I learn about Nim, the more I appreciate its design decisions and think to myself: this is the faster version of python I'm looking for. Now, we just need the large package ecosystem that python has, but I'm willing to both wait and participate in making it come about.
This presentation about writing keyboard firmware in Nim may be helpful, if you're willing to give Nim some more consideration:
There is also another talk about embedded programming in Nim from the same conference, here: