Sounds like an interesting experiment, let us know how it turns out. any reason you aren't using irish moss?
I have been using irish moss and it works quite well. I will continue to do so but If I enter a bitter into a comp I want it to be as perfectly clear as possible and it seems like, short of filtering, a gelatin type fining agent is the way to go. isinglass being traditional. Plus at some point I want to try cask conditioning and it seems that with the added sediment from that stage of fermentation would make it harder to get really clear without some fining.
I have a batch of basil ale in primary now and a pack of agar agar flakes so perhaps I will try it next weekend! I will report back the results although to be really useful I will have to make a 10 gallon batch of bitter at some point and fine 5 gallons and not fine the other to get a side by side.