Cool idea. I use a Tibloc on a sling/tether to deal with a similar situation SRT climbing (moving the rope through a redirect so I don't have to climb through the redirect). If I run into a limb captured by a DRT system I usually just lanyard in, unclip the carabiner on the standing end and move that up and back over the limb, then clip it back in to my harness. For most broadleaf trees isolation is not much of a problem, for conifers it can be a big problem, which is why many folks prefer to access conifers SRT, no isolation required.
-AJ