Putting another option in the mix -perhaps you have considered this :
Not sure why you would want to surrender the PPL. I may be wrong but I seem to recall you can operate a PPL on a LAPL medical with the LAPL restrictions and retain the option to jump back to PPL with a class 2 medical.You can also operate non easa aircraft on a PPL with a self declaration
https://www.caa.co.uk/General-Aviati...rivate-pilots/
The other alternative is an NPPL which you can use with a self declaration medical up to 70. You can also hold the NPPL in parallel with the EASA PPL. Though oddly you cannot self declare and hold a class 2 at the same time...