There are a few short blessings and toasts here:
https://onefabday.com/traditional-irish ... blessings/There are vows in Irish on there but some of the grammar is not correct. If you like something there, let us know and we can correct it or add to it.
As far as something longer in terms of writing, I'll have to look in some of the poetry books and other literature I have on my shelf and get back to you. Someone else may be able to help you with that, too.
And there are songs, of course. Enter "Irish Gaelic Love Songs" into the YouTube search engine and a lot will come up. Often, they provide the lyrics as well.
Is there a particular dialect of Irish you would like? Munster and Conemara don't pose much of a problem but there don't seem to be many Northern speakers on the forum at the moment.
And then there's the hand-fasting ceremony:
https://onefabday.com/how-to-do-a-hand- ... -ceremony/