If the data layout is unchanged, then parity would be valid.
However... I'm not sure how to figure that out without just doing what you said. I don't see any issue with your plan, I would definitely check the box stating parity is valid, that way there will be a parity check triggered instead of a parity build. If there are zero errors and the disk mounts, then you will be good to go. If there are immediately a wallop of parity errors and the disk doesn't mount, cancel the check, stop the array, unassign the disk, and start the array and see if the emulated disk mounts. If it does, then a rebuild on all the drives, one at a time, would fix it.