Ive ran a 2 in 1 and hated it, DEDA lanyard works alright, I prefer to take a rope lanyard up with me and flip flop between my flipline and lanyard as needed to pass limbs, or use my climbing line on my lower D's lanyard on hip D's
climbing line functions as a long lanyard in this setup, SRT or DRT device, hitch climber, almost any adjuster works for this just fine
starting off, I would just get an ART positioner swivel, and 15ft tritech with a snap, will be a few hundred bucks but well worth it