Chris,
It's a shame to hear of your frame troubles. As you know from all of our oohing and ahhing, we all think you have a great looking bike. I am rather certain that the cost of the frame and shipping costs will be prohibitive but, just for the record, "British Only", here in the States, appear to have a variety of possible frames for your bike. Here is the link to the page I looked at:
http://www.britishonly.com/estore/categories/frames/bsaA10.aspIf you do end up trying to deal with these folks, keep in mind that they can be hard to communicate with, as they are moving toward going out of business. On the other hand, that could play into your favor if you get into negotiations. I don't know if they will guarantee the product, however, I have a feeling that the provenance of what You get could be verified as legitimate.
I suppose you will probabaly keep an eye out on that side of the Atlantic, waiting until the right deal comes along. That's what I would probably do, being cheap.
Richard
