I forgot to switch mine on for the LRA a few years back, Ken. When the inspector said he couldn't print a receipt and I said I think I know what's wrong there he just told me to have a look at it and he'd come back in a few minutes. 8 minutes later he came back, printed his receipt and went back for the stickers... Happy days!
In any event, it'd be easy enough to bypass the switch for the test, it'd just look like an obsolete roof sign switch or you could spend another minute at it and remove it completely. I think I did that once, probably the first year we had printers.