@MrT10001 It is possible actually, I have done it on mine. But you are right, the hard part is getting it on android 11, which I managed to in the end by tricking the lenovo rescue and smart assistant into restoring android 11 instead of 10. I first ran a normal recovery, which recovers it into android 10. Then I replaced the ROM files in the C:\ProgramData\RSA\Download\RomFiles folder with the android11 ones and ran another recovery. Worked without issues and after that installation with UBports was a breeze.
So far the user experience has been quite good, not sluggish at all. Although I only just installed so it might deteriorate as I install more apps.