Your question refers to NEC3 but I believe this must be a typo in that you mean NEC4 and the use of X22.
In principle yes you would be able to use the intention of X22 but not X22 itself. I would suggest you could recreate the process as Z clauses excluding those that relate to Option C and with careful consideration as to whether there will be an incentivisation against the Budget and how the Contractor will be reimbursed for its input in to Stage 1 and hence what provisions from X22.2 would be required. It would need careful drafting and checking.