Been using R&K Salix IG ink daily for almost a year now. I clean and flush the pens before each refill and have had zero problems.
Prefer piston fill pens as they hold more ink than cartridge or converters. Had a few converters fail on me, (ink leaking behind the seal and getting in the barrel). Also have had flow problems with cartridge and converters. Never had any problems with a piston fill's ink flow or leaking.
Filling from by dipping the pen in a bottle of ink is no big deal. Just be a bit careful and wipe the pen clean. Sometimes I do get ink on my fingers and then I just wash my hands. No problem.
If you're worried about getting inky fingers, wear disposable gloves. You can get a 100 pair for a few dollars at your local hardware store or online.
ETA: In my experience when using adapters of any kind you're creating an extra contact point of potential failure. I don't even like using electrical or plumbing adapters for this reason.
Edited by Tasmith, 15 December 2017 - 14:28.