Thanks Luka...I think those Hirose use a synthetic/rubber insert...which while might be IP67 would probably not be enough for hermetic seal, or a seal that lasts.
I'm mainly looking at Sockets that have the glass fibre type sealed inserts (that will fit, also have a good current rating ~3A or more), like:
Molex Ultra-Lock M12.
Molex/Brad 120084 series.
Yes some of these have "PCB" type pins one the rear, i'm sure there would be other terminations available...or I cam make a sub-PCB to solder wires and this connector to. "I'm sure these are more that I've missed.
edit:
We could resin pot the end of a connector ourselves....like the Hirose?