Re: [Waldschrat] retrofit a Dagger
Yes. I'd say about 500 bucks, too. I know that BR (pre-Apex) retrofitted one of their canopies for me, so I would imagine they'd be able to do your Dagger. But, if I were you I'd probably just have a good rigger (one with real experience sewing canopies) do it locally, because the shipping across the pond could be a pain.
I'd recommend using the 5 valve layout (like Troll DW), and something like the MDV, if possible. If Atair was willing to do it, I'd go with that option, but last time I asked (it was several years ago) they were unwilling to do the retrofit on a canopy they hadn't manufactured.