Damaged glass, what if I get a cheap watch just for swimming to go along with it?

How does the Connect app and syncing generally behave when using two watches with different features?

I have a Forerunner 955 that I use for hiking, cycling, kayaking, and swimming. I've noticed I've chipped the glass, and if I can't get it repaired, I was thinking of adding a Forerunner 55 or another watch to use exclusively for water activities, as I am afraid my fr955 is no longer waterproof.

But fr55 lacks many features from fr955 (of course). How this will affect my experience and the connect app