All of my battery chargers are rated for 50/60 so that is not a
problem. What is an issue is 220 V non-center tapped. For that you
need an isolation transformer rated at 12 KVA/50 Hz. You can pick
them up on EBAY for a half reasonable price but you need to build a
weather proof enclosure and install some Euro style inlet connectors.
The isolation transformer also solves the GFI tripping issue which is
common on some Euro docks.
An isolation transformer should not trip the RCD, in fact it will
prevent the RDC from tripping on a fault.
If your charger has a 220v tap, it should work tho. (assuming they
want 120 now)