Changing grid settings to acommodate generator

My generator is not excepted by multiplus II because i am connected to the grid (to dump extra PV) and the generator is producing 53 hz. (50 is normal in the EU). It is accepted when i set the grid to “None”.
Is there anything i could damage if i change the grid code settings to 53 hz for “normal connect”, “reconnect after trip” and “p(f) funtionality” in my Multiplus II?
I know i then do not comply with the norm, but since multiplus allways follow the grid what could go wrong?
I could then connect the generatpr to the multi, set generator to on in the cerbo (to make the multi stop backfeeding PV to the grid (at that moment the generator)).
Hope someone can help me.