The SCSB calculation is based on your gross salary before any pension contributions are deducted, so I don’t think your plan above will make any difference.
are you trying to reduce the future pension lump sum amount? Not sure its possible to transfer out of an occupational scheme until you actually leave your current employment.
others here may be able to advise if you can waive the lump sum now, and then later move the pension funds to a PRSA and get the 25% TFLS when you actually retire.