RP2350 is using a hybrid of ARM and RISCV already. Also it's not really hard to use RISCV not as the main computing core but as a controller in the SoC. Because

RP2350 is using a hybrid of ARM and RISCV already. Also it's not really hard to use RISCV not as the main computing core but as a controller in the SoC. Because the area of RISCV cores are so small it's pretty common to put a dozen (16 to be specific) into a chip.