Should work well, it's the same type of synergy that Dark/SR scrappers get.
Icelock - Ice/Storm Controller
Command Bot 1 - Bot/Traps MM
It's a nice combination, very well geared towards team play. You will be popular 
My FF/Dark, Dark Corridor, was a blast through to the 20's, but my main point of contention would be the higher level FF powers don't mesh that well with the protective - team oriented - bubbles as they are all knockbacks. That comment for PvE.
Do it, it's great. I'm still loving playing with Composure and whilst her early days where very team orientated, recently I've been playing around a lot with the build trying to squeeze every last drop of goodness out of it to make me effective in all aspects of the game. And in my opinion it works.
The sets do have a synergy and it's rare your team will get in any trouble. Also dark has a heal and whilst not particularly great, it does make up a little bit for not having one in your primary set.
I use all my bubbles a fair bit and the only one I haven't taken is repulsion bomb, which I think most bubblers agree is a waste of a power.
The only exception to this is force bubble which I don't use particularly often and am considering respecing out of. I still think it's a good power though, I'm just not great at using it.
I skipped dark pit and torrent from the blasts. Some people like dark pit for the control but I'm not so keen on it.
Also I've found that in teams I rarely have end issues, but solo I tend to run out fairly quickly. However currently I don't have end red enhancements where I should have, so you might want to think about that.
Solo is completely doable though.
I think it's a great combination, any questions you have I'd be happy to see if I can answer them
So now your a defender, you kaya have a problem 
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So now your a defender, you kaya have a problem
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Possibly not for much longer. Being unable to play at all lately due to disconnections and lag I decided to dust off AO and have really got back into the game. Gonna give it to I7 but I may move back there.
Well you know I ditched Honeybee due to finding dark being not my cuppa tea. I guess others may enjoy it though.
Just started there before I took my break Honeybee Mk II and found Psychic to be much more fun.
I've been toying with the idea of starting an FF/Dark defender for a while now. My idea being that the added defense from the bubbles will synergise nicely with the accuracy debuffs from the dark set. Any thaughts?