This seems like a very silly thing to get worked up about. Almost as silly as the rock character from the kids book that I don’t think anyone here actually read. Are these things stupid? Sure! Should you care? Probably not.
Call the ship whatever you want. Nobody is gonna stop you. It’s not like Disney is altering the OT by going back and dubbing over every time someone utters the words “slave one,” or something. They’re apparently not going to use a specific name anymore, that to my knowledge never was used in any of the films (or in the Mandalorian, as far as I remember).
If you like “Slave I,” call it that. Similarly, if you think the name “Ponda Baba” is stupid and you prefer “Walrus Man,” go for it. Hell, call him “Baboon Butt Chin Man,” because that’s more accurate.
Or, keep freaking out over every inconsequential thing that changes, I suppose. I’m sure there will be more, and the sorts of sites and youtubers who subsist off of fomenting silly outrage about this stuff will be more than happy that you clicked, once again.