Yes, that's a good idea to use your own nodes, and you don't need Watch Swaps for that. Watch Swaps is if you want to find a node that is willing to watch you and you don't control it.

BTC_LN

bitcoin

🔐 Protect Your Funds: Introducing Watch Swaps on LightningNetwork+

This is a great idea, when your node goes down or you have to stop it temporarily someone has still got your back. It would make sense to use it among several of your own nodes, not sure if that's easy enough to do anyway or not but this certainly would allow that.