Converting PF30 bottom bracket frame to SRAM GXP cranks

[Foreigner]

Currently running PF30 bottom bracket with matching SRAM Force 22 cranks - 175mm AND 53/39 - and want ot swap for SRAM Force 22 GXP chainset as it is 170mm 50/34. What are the tried conversion kits, would PRAXIS one work OK or are there any other not stupidly expensive solutions out there.

FSA conversion kits are available for MTB/86mm frames, what about for road 68mm shell frame?