Michael (groovelines),
As a self-taught player, I've handled an acoustic upright perhaps on 10 occasions in 30 years of playing bass guitar, but have never owned one myself. I didn't feel intimidated, but the ones I used were probably 3/4 size, where perhaps 41 is full size?
Even if that scale is 20% longer than a 34 bass guitar, and the strings are in a strange position, the proportions on the fingerboard are the same, so your fingers will know where to go. I know the lowest notes are further away than you would expect, but I've noticed the same on a fretless 34 - so it's more a question of making the intonation happen, so you finally can be in tune with that keyboard ... which by the way will probably not be in tune with an actual piano. Neck shape is another issue - probably more rounded in the back, and defintely more arched on the fingerboard.
The brochure for the WAV says it's setup with light action, but it can be adjusted with a trussrod for neck relief, and the bridge height can be changed.
unforgivably tempting nails it!
I've always loved the way that uprights can make the notes stand up, even at low volume. (I know, it's the player as much as the instrument.)