Gotta do what your comfortable with. Only downside I see is in situations like this once you say no your at the bottom of the call list or forgotten.
Ordinarily, maybe, Bill ... but I don't think so in this case ... I've been this guys 'unofficial sub' at this place for years, and since he's a musician, he understands my position ...
Also, his wife is a nurse, and before he goes back he has to be tested ...
But, we will see what happens ...