My main bass is a 5 string but I also have a 4 which I defretted. I really like playing fretless but I would like it to be a 5 and there are some things that I just can't do with a fretless (some slapping and chord work). I sometimes swap basses part way through a gig but our songs have lots of sudden changes and I would love to be able to swap from fretted to fretless mid way through a song. For this reason, I have been considering a doubleneck (2x5 string) but a good one will be expensive and/or heavy not to mention a bit silly. So I started to think that maybe the way to go is to play my normal 5 string fretted and have an upright on a stand which I can walk up to when I need it. Has anyone else done this? Are there practicality issues such as having the fretted bass hitting the stand up or having a sore back from bending forwards? I thought of going into a music shop and trying it out but I am worried that they might send in some men to take me away.