Regrettably, you will need to fly the NPPL GST with an Examiner.
There will probably be a fee to pay to the Examiner, but you do NOT need to send ANYTHING to either the CAA or NPLG. Not even a cheque!
Congratulations on actually knowing the recency regulations - these were NEVER proposed by industry but were a CAA cock-up.
Hopefully we will soon have some good news about revalidation requirements.....