I think vow renewals are great for people who didn’t have their dream wedding or just want to celebrate their love again!
I think in your case, this would be entirely appropriate. If you didn’t invite a ton of people to see you get married the first time, I’d even consider doing the whole ceremony again. Vow renewals typically have some sort of “ceremony” type thing where the couple can actually say vows again, but there’s nothing wrong with just having a celebration if that’s what you want. I think it’s completely appropriate to do something like this for your case 🙂