Looking at a recent CAA info note, VFR at night has been introduced ahead of the start of SERA (standardised european rules of the air).
Will SERA affect European States wrt GPS approaches? The design of approaches is contained in an ICAO PANS (Doc 8168) so where ever you are in Europe, you can expect the same level of safety whilst flying the procedure.
So the challenge is the environment around the runway. Can separation in IMC be assured? Can a pilot on approach receive a clearance to land from someone who is not a validated ATCO?
Even if it's a difficult ask doesn't mean a solution shouldn't be looked for. The UKs situation does impose an extra challenge due to privatisation though the introduction of a lowered floor for BRNAV because of radar coverage down to circuit height shows that a service could be provided.
So an equitable way to fund such a service has to be found. If the current provision of radar coverage is fully funded the on cost will be marginal. Surely this is a starter for 10?
SGC