thanks for all the replies guys
CB500_k2, I'll have to give them a shout, I'd still like to replace the whole unit, but this gives me the option of just picking up a new bucket and having a reliable source for the rest.
tinman25, if you want to check that out and grab a few pictures for me, I'd be very interested in what you may have. Mines rusted out inside so doesn't reflect the light out, and the bucket has some cracks, but the bulb in it works great and I haven't had any problems really with it. I'm in Ontario Canada, so hopefully shipping wouldn't be too much to make it not worth it.
If anyone has any suggestions for whole assemblies they think would be able to handle the huge amount of clutter in the headlight, but would still be reasonable for a CB350, give me some links and I'll check them out. Hopefully I'll be able to find something worth recommending to anyone else who in my situation.