Alternative to love light letters.

Ah ok, maybe a flower wall or some sort of back drop wall or flower arch? You could maybe do pics of you both from over the years on a big wall behind?

If you had a budget for L>O>V>E letters then for a big impact I would say to use the money for extra uplighters all around the room. Or fairy light swags, or a star curtain. I sometimes see that LOVE letters start off ok when used in the day but in the evening can get swamped by DJ equipment as they are normally placed on or just off the dance floor.

Here you have everything, uplighters, a star curtain at the back and fairy lights in swags. And hired chandeliers too.

Yes DJs usually are the ones that supply it, sometimes they charge extra or they are included in their package. If its already included ask how many they have with a view to seeing if you can pay extra for them to source some more. But depending on your venue walls and ceiling they may not work so well.