In fact a reasonable compromise is possible: rust is perfectly capable of interoperating with the C languages.

I doubt you work on software for a living, because not only are you arguing a problem in a desperate need for a solution but also no one in their right mind would think it is a good idea to double the tech stacks and development environments and pipelines and everything, and with that greatly increase the cognitive load require to develop even the simplest features, just to... For what exactly? What exactly is your value proposition, and what tradeoffs, if any, you took into account?

You are free to do whatever you feel like doing in your pet projects. Rewrite them in as many languages you feel like using. In professional settings where managers have to hire people and have time and cash budgets and have to show bugs and features being finished, this sort of nonsense doesn't fly.