Andrew, this all sounds positive to me.
The only thing I would suggest consideration would be to have strong links between boonex.com (dolphin) and 'other site' that would host Trident.
If you're not thinking to migrate the users, then at least make a join login...
Complete separation would make life difficult for your long term Dolphin community to keep on top of both scripts - which Im sure they would want to.

I personally have very limited time between family, life, work and personal see more online projects, so tend to limit myself to only a few websites - especially those that are community based as Boonex is, and I expect 'trident host' would be.

complete separation while I imagine you have your reasons for wanting, I think also has some very strong negatives for the community here.

Other than that, looking forward to seeing both scripts develop.