Hi Paul, welcome to the Club and congrats on your first Alembic!
To determine the scale length, measure the distance from the top nut to the 12th fret, and double that. On a 34, most long scale strings will fit. The separate tail piece and the 2+2 peghead arrangement add up to a string path that is slightly longer than average. I once had a problem with some D'Addarrio roundwounds where the A string barely reached the tuner, but that was from a line that they no longer offer. I like DRs, and they have plenty of length. And one might assume that Alembic's own strings will fit too.
When in doubt, lay out each of the strings on the instrument from tail piece to beyond the tuner. to make sure they're long enough, before installing any of them.