Thinking about it now, the thing I would like it for is maybe a practice instrument for late at night. I'd have to figure out how to isolate it from the floor. Stuffing the F-holes should be pretty effective since the body is so thin.
I would say that that bass is probably better than most EUBs for that purpose IMO. The body has the right width so you don't need any funky armrests, and a good weight so it doesn't torque on you like an EUB would every time you pluck a string. You get a real neck joint as a point of reference for thumb position. Etc. etc.
For the purposes I'm talking about only something like an Alter-Ego or Yamaha Silent bass would be better - since is they mock body parts that are more realistic than the average EUB.
Could I ask you to stuff the f-holes with a towel or two and see how loud the bass gets?
I suppose if you were serious about it, you could fill it with spray foam.
) Also, if you want to have a quieter instrument for practice, it might be worth it. These seem to be major issues for fully acoustic uprights, at least from what I've seen on the forum here and in my own year of playing. 
