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You can use a Shimano ht2 BB with a '22 to 24mm' adapter and a wavey washer on the driveside
You'd then effectivelly be using a GXP crank to prematurely fuck an HT2 bb.
Its the stepped axle and shifting of axial loads to a single bearing that causes the issues with GXP and you'd still be doing that with an adapted HT2 bb
The bearings in an HT2 bb might be superior to those in a GXP bb but given that the GXP nds bearing has a smaller ID you'd hope that it ran larger balls to cope with all the axial loads so adapting an HT2 bb actually sounds like a way to make a shit system even worse.
You can use a Shimano ht2 BB with a '22 to 24mm' adapter and a wavey washer on the driveside