You can literally do anything you want. If you want a shower, have one. If you want it to be non-traditional, do that. If you don’t want one, politely decline. That’s the beauty of being a bit older and wiser than the younger friends that you mention kind of just going along with “tradition.” And there’s nothing wrong with tradition if you like it. Just decide what would make YOU happy and do that.
Curious, how big will your wedding be? Are you inviting a lot of people or keeping it small? FWIW, I’ve had people do all kinds of different registries and never felt like any were “asking for cash” or whatever. I think people are used to that stuff now – it’s not groundbreaking.