Model Y Juniper just started shipping this month. Its a glaring sign that says they bought it after everything Musk did.

Feasible, yes. Practical, hard to say. Good idea, yes.

RISC-V is open-source architecture based in Switzerland (although it started in University of California).

One thing going for it is China is spending billions a year towards RISC-V adoption so they do not get sanctioned by the US. You need money and engineers working on it towards these type of open source to compete with existing players.