I only realise now that the crankset is GPX, so I guess this crankset is neither compatible with a BBright bottom bracket nor with an Ultegra FD-R8000 derailleur, what do you think?
https://it.aliexpress.com/item/1005008153991818.html?spm=a2g0o.store_pc_home.0.0.32a964f26sgUid&gatewayAdapt=glo2ita
There is no true GXP (22/24 mm spindle) crankset on AliX. When they refer to GXP they mean that the spider interface is 3-bolt SRAM. It has nothing to do with the spindle diameter, which can be 24 or 29mm. If the crankset you will choose has 24 mm spindle and says GXP, it means that the spider interface is 3-bolt. The spindle will fit in your current setup with BBRight for shimano spindle that you are currently using.