It could be worse. No matter how bad the BF->Rust code that's generated is (it'd literally just be BF in a less compact syntax, most likely: it's pretty hard to convert idiom-wise), it's probably better than the Troff sources (as written by Joseph Ossanna).
Honestly, it'd probably be worth the effort to just write the Rust up front. The kind of technical debt you'd land in otherwise... euurgh.
That's been a tough question to answer recently. The greedy and the idiots are always on the top of my list. There's significant overlap in those in market segment that might buy this CPU. They strangely also have a large supply of cash that's been flowing for a long time. I wouldn't have guessed that based on what they taught me back in high-school about economics.
Honestly, it'd probably be worth the effort to just write the Rust up front. The kind of technical debt you'd land in otherwise... euurgh.