Help me understand/find higher voltage motor drivers?

I have several HVAC compressors and fan motors i'd like to use for some projects. They range from 165vdc to 350ish. I have the boards that pushed them, but don't have the EE knowledge to modify or simplify to make analogue inputs. I've looked around for generic drivers, but am not really finding anything in that range.

Is there a <$200 of the shelf solution? Is there a very simple PWM schematic I could fumble my way through building? I don't necessarily need all the fine control they are capable of, although a simple speed control to fine tune them to my applications would be nice.

Assuming they are worth repurposing, even pointing me in the right direction would be great. I'm in one of those situations where I'm pretty sure the answer is on the internet, but I lack the vocabulary to dig it up. I'll also accept they are just not worth messing with out of their OEM niche if that is the case.