I definately think what Decords and Teresa have suggested is the way to go
If you're on a budget, something has to give, and why should it be your honeymoon? I think having a later service, then a "tea-time" meal is a good way to cut back, your day guests get time to have lunch so won't starve, and your evening guests can have a biggish meal beforehand.
Put together an "Order of the Day" advising, like Decords, that only light snack will be available, it's a polite but informal way, and nobody can accuse you of not telling them then
Good luck with what you decide,
Lo x