It may be as simple as installing Control:PC on your Roon server, exporting natively to the local storage on the Roon machine then installing Roon and pointing to the local exported files, at which point the Sooloos core / stores become irrelevant.

This way you leave your existing system intact and untouched to go back to if you are unhappy.

Once you are happy and want to decommission the Sooloos system, you can then reuse the Sooloos storage drives as backups for Roon. (meaning you only need an extra 1x current storage to get started for a 100% test - or with a partial export, the amount of space for the test subset)

MC200's are probably not worth keeping with Roon - resell and use the cash for an MS200 - and an off the shelf NAS will be a better bet for storage, than repurposing an MC200.

An MC200 (or MD600) will work as generic NAS storage - unfortunately the lack of configuration/security means it's resale value as a Sooloos component might be more use. The only real use I can see going forwards would be Sooloos endpoint firmware updates.

Not too sure what's going to happen with resale value though - either during the uncertainty period, or when we finally know how things are going to play out.