You're back! Huzzah!
I don't have a lot of experience with washi tape, but in my drafting classes, we still worked with pen and paper in one course. We had tape designed specifically to hold paper in place on the drafting table, but removable so it wouldnt damage anything. See if drafting tape is sold anywhere there, maybe?
Ahaha! Well, it was not easy to step out of the shadows I was lurking in. I am still feeling like a deer in the headlights.
I will have a look. Maybe in some art shops in old Riga. I am still trying to tame the washi tape with various outcomes.