Your boss would have no leg to stand on if you refused to fly under the circumstances you describe, because a light twin with no radar is in NO way adequate for the job. Period!!!
The rate of ice-accretion possible in, or within, the vicinity of even a small CB has to be experienced to be believed, ditto the turbulence which can tear much stronger airframes to shreds (I know of a King Air that shed a wing outboard of the nacelle due to exactly this: flying at night with an inop Wx radar) Hail the size of tennis-balls can damage a commercial jet so heavily that it is written off - it will go through the paper-thin windscreen of a Chieftain/Titan/310 etc. like a gatling-gun.
I'm not being melodramatic. I've been in your shoes (and did the wrong thing!) and was very lucky.
Don't do it. Really, really, don't.
Last edited by Doodlebug; 2nd Aug 2008 at 16:30.
Reason: to better make the point, I hope!