FanCake
...
If I...
Install a final release
then later on your preview/RC version.
then later on install the next final release.
If I decide to roll back at this point, which version would I be rolling back to? Is there a choice?
Just to better illustrate what I think you are saying...
1) March - You install the official public release.
2) April - You decide to check out the Preview. There's no issues with it so it eventually becomes the official public release (i.e. same build number, we just remove the "Early Access" label from the installer name as it appears in your store account - it's still the same bits).
3) May - You install the official public release, but don't like something with it so you want to roll back.
At that point rollback will install the last official public release for April. Let me know if I followed your question correctly.
Jim