Lanai is significantly older than RISC-V. These days you'd likely easily pick designing or using an existing RISC-V core for an application like this, possibly adapting it to your particular usecase.

The decision is different, however, if you happen to have the entirety of the Lanai engineering team on board and own the entire Lanai IP portfolio. :)

Reminds me of the various uses that have come of the IP of the https://en.wikipedia.org/wiki/ARC_(processor) — including inside the Intel Management Engine! — since its ignominious start as the SNES SuperFX chip :)