Hi Dave,
Why not just make a thick sleeve to go over the broken bits to hold them together. A dollop of JB weld and a few strategically spaced screws will make it as good as new.
You could get it welded but you would have to consider pre and post welding heat treatment to prevent distortion or cracking. You might also loose alignment of the bits if welded. All in all, better if you go the sleeving way. You might have to get someone with a decent size mill to use a back to front cutter in a boring head to machine the casting to round first, if it is "as cast".
The broken handle should be no problem to fix, just drill and tap for a short length of all thread.
Don't sit and mope, fix it!!

Good luck,
Ned
PS Re. dropping things, easily done isn't it!

I had a similar problem with the leadscrew handwheel on my Myford, soon fixed though with no drama.