My understanding is that there are moves afoot to allow a full EASA PPL to be used with an LAPL medical (with LAPL privileges only) and that this change is expected possibly in the second half of this year.
The existing requirement to give up a full PPL to enable an LAPL to be used with an LAPL medical is absurd, particularly since reacquiring a full PPL will again necessitate more expense and testing.