I'm sure you are aware that Alberto's actions also affect your reputation as the guy doing the PR for the BDT fund. So I don't think it is wise to take this issue lightly and to state that your personal interests (trip to London) are more important than the interests of the people you encouraged to invest in BDT.
Will all due respect the Bitcoin conference is important (
especially given recent events). The BDT issues are important too but not enough to cancel my attendance, or to leave without getting anything prepared (which is where I'm headed at this rate after all the time I've spent on this). My power to affect this is fairly limited, and whatever we do the matter will not be resolved in a matter of days, so there's no point in thinking that it will and that I have no other commitments than BDT.
Also, "encouraged to invest in BDT" is a bit of a stretch. I encouraged people to make their own decision.
I do not agree to a buyback of 1 btc per bond. Unacceptable. If he wants to buy back at 1 btc then he can buy them on the open market, but I will not accept a forced buyback of 1 btc
I didn't say it's ok. If Alberto only pays the face value (in addition to the interest already accumulated) he won't be a man of his word, but I don't think he'd be a thief either as far as this is concerned.
The worst part is it really seems like we aren't any closer to having a vehicle to hedge BTC/CurrencyX exposure

Not sure if it's the worst part, but I know, it's a bad part. You have icbit.se though.
Great, yet another security is in default. If Alberto fails to repay, I would like to pursue immediate legal action. We will have to coordinate this next Wednesday when you return from London.
This possibility will be explored if Alberto fails to make significant progress. But I don't think we can expect him to repay in full in a week.