Changing the splash

I'm running -deck as a TV/Console experience. When booting, or switching to desktop mode, the splash screen with the spinner & bazzite logo is waaay too small and I'd like to change it out. I'm comfortable messing with plymouth & SDDM themes. Just wondering what the bazzite-approved way of accomplishing this is, or even if there's just a larger-format drop-in replacement already baked-in.