Wedding Cake

That is a question for local bakeries to find out what they can do

View Quoted Comment I've tried. They just keep saying you can't put ribbon to glaze, they don't say why or suggest anything else. It's very frustrating

My mom works with a lot of pastry chefs and went to culinary school. It has to do with the ribbons staying flat/smooth on the glaze. Also if anything touches the mirror glaze, object/hand/tool/ribbon it dulls and dents the glaze making it not smooth. Once you ruin the finish, there’s no fixing it

View Quoted Comment Thank you. Do you know if there is any alternative finish?

View Quoted Comment As in the exterior?
You might look into buttercream and airbrushing a galaxy scene or multi colored marbled fondant to look like outer space with gold dust as stars. Neither will give you gloss, but they’ll both be able to have ribbon on the bottom of each tier. I will say, fondant doesn’t taste very good

Fondant, while it doesn't taste very good, can be brushed with a shimmer finish to give a metallic sheen. Nothing will have the same gloss as a glaze, sadly. Goodluck in your search! I hope you are able to find something you love ❤️