I'd be fine with doing some sort of prologue, though I think it would be better for establishing what you did at the Mountainhomes or dealing with last-minute business than the lengthy, involved, integral part of the game that it was in Cobalt Fortress. I could even see doing some sort of statless, skillless, purely RP-and-GM-fiat thing to establish your character's stats/skills in the first place, rather than building a character normally.
I'd also be fine with just selecting items and fast forwarding to the embark site, however.
I actually had an interesting thought for adventure vs fortress. What if we ran the two simultaneously? As Cobalt Fortress showed quite clearly during the initial elf mission, and as similar games have also shown, it's kind of unfortunate when the game grinds to a halt to allow adventures, and when not everyone's on said adventure the game just stops for them, which isn't cool.
For example, let's say that the party decides to explore a cave. Normally, all the normal fortress operations stop while they do so, and anyone not exploring said cave is just on hiatus for a while. What if instead, the fortress game's turns continued as normal while the cave bit was going on, so people could stab rats and make glass goblets at the same time? Sure, there'd be all sorts of continuity weirdness no matter how you justified it- dead people working on projects or people continuing to make crafts well after they realized the river mouth led directly to hell- but would anyone really care in the face of uninterrupted turns?
We could even do continuous adventures this way- when one ends, we jump straight to the next issue requiring face-to-face dealings-with. It'd also allow for people to split off and do their own thing effortlessly, since it doesn't directly what everyone else is doing adventure-wise, since it doesn't affect fortress mode or your own adventures (with some obvious exceptions, of course).
I'll have to think about high/low tech/fantasy/combat, though. I do know that I'd like high fantasy elements to exist, even if they're quite rare- so whether or not stomping the ground to throw everyone around you down is a valid normal attack, I'd like it to appear on legendary warriors and such. Not that we're likely to fight many of those without dying, but still.