Just before Christmas I bought Status flats and half rounds, so they still have someone making them! These were short scale. Haven't tried the flats yet as the half rounds went on first and I really like them!
My Sei has a head(less) end that will take double ball end strings or clamp regular strings. I've always found Status db strings fine in round flat and half rounds flavours
That's exactly what I have! Most options are available in black tbf.
My other headed basses have Sperzel locking tuners which I like a lot, but not sure they would look right. I don't mind the Y tuner Schallers and Hipshot ones though.
The effects send output might be a bit hot for an input that is expecting a low level guitar signal. It may clip in a way that isn't pleasant, unless that's what you're going for.