Using a BS Dual Circuit Plus with a DC-DC Charger?

Hello,

I’m doing a rewire of '58 boat and was considering a BS Dual Circuit Plus switch (Part 5511E) which isolates the start and house batteries. In case of an emergency (low start voltage) the switch has a “Combine Batteries” option. Can this be used in conjunction with an Orion DC-DC Charger? Was thinking of an Orion XS DC-DC Charger 12/12-50A, 1400.

Thanks