As a few other posters have said, just elope with just you and your partner, and then come back and have a meal with your DP, and yours and his friends, and any family you may have. Even if it's only 9-12 people altogether - including you and your DP, so what? Much better to have just a handful, or even just one or two people in your life who love you and care for you, than 100 fakers and hangers-on, who use you and abuse your trust and friendship.
I know LOADS of people who had 200-250 people at their wedding, 80% who they barely knew, didn't know, or didn't like. Many were colleagues and acquaintances of the parents, and even work colleagues of the parents. Along with loads of extended family that the bride and groom hadn't seen for 2 decades, who they had fuck-all to do with, and who they didn't see again after the wedding.
We had 29 people at our wedding, including us 2. We had to pay for it all ourselves as both sets of parents were poor, so we were totally in charge and VERY selective about who we invited. Many people were offended and sniffy at not being invited, and some people gave us a wide berth after, as they were soooooooo disgusted and slighted at not being invited. Good fucking riddance.
Please don't be fooled into thinking that people who have 100+ people at their wedding are happier than you, or more popular than you, or BETTER than you. None of that is true.
@Cheesecakeitalian
Good luck to you in all that you do.
Hope you and your lovely partner are happy forever.