I removed the handrails and mounted Lewmar DC1 triples (my eventual plan is to add mounting pads on the ridge / gutter like
@CloudDiver did and re-mount handrails, but I haven't gotten there).
With the handrails in place, I think you could fit singles, but probably not doubles. Some people have removed just the last hand-loop; I think you can fit doubles with that system (and still have a clear lead for the lines); hopefully someone who's actually gone that route will chime in. Hope that helps just a bit.