I like these type of ideas although I am too fixated on being able to exit the tree quickly at all times if needed. Something one of my mentors drilled into my head.
Unless you pull it, the SRT line is always there ready to take you to ground. If you did pull out the SRT canopy anchor, you then have enough rope to go to ground DdRT.
Granted, there are times when you have switched to DdRT, have left the SRT canopy anchor in place 85' up, but disconnected from it, that it could take a little more time to pull the SRT canopy anchor while you go to ground DdRT. Not a lot longer, but I wouldn't want to be caught that way with a swarm of bee's attacking.