Yes roughly once a week, for 2+ hours
OK. Yeah, looks like the BNC adapter would be an option, but long term that might be an issue. Removing the antenna, hooking up the coax and adapter, undoing all that, might take its wear and tear on the radio. But would be a cheap/simple solution.
Any solution that requires buying a new marine VHF radio might just be better solved by sticking a marine VHF radio down in that compartment with an antenna topside.
I'm looking at the Sensear website.
Looks like they don't make interface cables for mobile radios, at least not that I've found, but they do have 'flying lead" with connectors that could interface to a mobile that had the right interfaces.
Also, looks like they have a Bluetooth headset. use that, and move the radio to a position where it has clear communications with the fueling dock, and still in reach of your headset.