I think it will work out well. Sea Scouts and Explorer Scouts get great reviews from active members as well as former members.
It’ll be fine over time
Ive spent time with Scouts overseas and work now with both GS and coed Venture Crew for ages 14-21.which most of the girls do both
But its nice for the older girls who want to do Philmont, Sea Base and other high adventure activities to have the opportunity
They keep up just fine - or lead the way