Can any of the planetary bodies be backported to KSP1? They have a lot more detail.
At this point, the best outcome I see for KSP2 is to backport as much stuff as they can, and offer it as a KSP 1 DLC (free to those who purchased KSP2, so as not to burn all bridges)
I'm sure they can export a height, normal, and color map, to make a KSP1 version of the KSP2 planets.
Ksp1 often used heightmaps of 2048x1024, but I can confirm that 8192x4096 also work just fine (I have even gone higher)
So more detail can be added to stock bodies in KSP1