No Registry-rather do Honeymoon fund/cash only

I agree with all of this.

OP there's really no polite way for a couple who is apparently in need of nothing to ask their guests for money. Honeymoon registries are deceptive to many as they just cut a check that can be used for anything at all. Plus a honeymoon is a vacation and your own responsibility, no one else's to pay for.

Registries themselves are only narrowly approved of in the etiquette world, and not by traditional etiquette at all, because they are supposedly the couple's own reference list of things they need. Guests have to look them up on third party platforms such as a store or wedding website or ask a close friend or relative if they know where you're registered. There is no possibility of polite spin with a cash registry.

There's no need to register at all in your case, nor is there anything weird about that. If people ask where you're registered, you can use the line that PP suggests, that you have everything you need/ are saving for a move etc.

Would you consider asking guests to make a donation to one of your favorite charities? You could include links to these charities. This gesture generates money for the less fortunate and I think would also tell your guests that you have all that you need. I could be wrong, but I think, people would get the hint and donate money to a charity AND gift you with money …I know I would

Admirable as this gesture sounds, unfortunately it's still inappropriate. If you want to donate to charity that's great, but you can't properly direct people to donate money on your behalf. A wedding isn't a fundraiser. That aside, if someone asked for donations to charity I don't know anyone who would give to both the couple and the charity. It's meant to be in place of a gift that benefits the couple.