Who to invite to Wedding

My partner and I have been living together for over a decade, have a baby daughter, and have been engaged for some time now. We're totally committed to each other and to being married, but the actual wedding bit is a source of stress that we've been putting off for ages.

We're in our 30s, both pretty quiet, shy and reserved people and don't really have any friends outside of each other these days. We lived abroad for a long time which is probably a part of it, and since coming back to Ireland we don't live too close to where either of us grew up.

Of who we might invite we both have old school and university friends but we've fallen out of touch with them to a degree over the years, there's nobody we see regularly. Our social life currently revolves around people in local parent and child groups but have only met very recently and aren't that well acquainted. We'd both grab a drink with work colleagues now and then (before baby came at least), but again these are more acquaintances than anything really. So the list of people we'd potentially invite is very small, and also we'd feel kind of awkward and embarrassed inviting them and leaving them wondering why there's nobody else there because we're sure none of them would consider inviting us if they were having a wedding that small.

On the family side, mine is tiny. I've no living parents and no cousins. I've one brother and a couple of uncles and that's it, and my brother is the only one I'm actually in touch with with any kind of regularity. My partner's side is bigger, two sisters, parents, with a lot of aunts and uncles and dozens of cousins, but again she's not close to any of them other than the immediate family and doesn't really want a wedding that's just full of her cousins while my side is so small and we've next to no friends there.

Every possible combination of who to invite feels awkward and uncomfortable to us. Just my brother and her sisters and parents for a single table meal? Or do I add my uncles to balance out the numbers, even though we're not close? I feel like they'd be wondering why I'd invite them to such an intimate wedding and not other people. But then if I added a couple of friends that feels weird too if it was just them and my partner's close family.

Personally I'd be happy with just signing a bit of paper to make it official without any fuss and to put all of our efforts into the honeymoon, but she understandably wants the wedding dress and all of that side of it to feel special, while she's also super self conscious about the whole thing. She's been floating the idea of an elopement wedding in Europe for just the two of us, there are packages that exist which I'm fine with for the most part but as I mentioned we have a baby we'd be taking with us and would really need someone we trust to look after her during the ceremony etc. The more we talk about it the more she's unsure though because she's worried it'd be kinda sad with just the two of us. So we've going around in circles and never really commit to anything.

There are extremely practical reasons (tax, security) why we really ought to stop delaying, though she hates thinking of it in those terms. I think we need to bite the bullet and decide on something soon.