Not entirely clear the motivations for the refund are in everyones interests here. Bobsag3 is already doing refunds on the undelivered R17 (Black Arrow) but refunding the original BTC amount which is of course for most people worth considerably less now in dollar terms. I suspect bobsag3 is getting refunds in $ at the original value and pocketing the difference. Bobsag3 if i'm wrong I apologise, but please clarify, you have ignored the issue so far on other threads!
My assumption is that we would be sent the dollar figure in BTC at today's exchange rate. The cost of this group but was quoted in $ in the OP. Hence my comment about making a small BTC profit but not a dollar profit. This is not us requesting a refund, this is DZ winding up the GB and distributing the remaining assets. Those assets being the refund that the vendor provides to the co-op.
Bobsag3, can you please clarify this for us?