Even if he doesn't, but provides valid collateral and then defaults, the lender can just sell the collateral.
There is more concern in the collateral though.
There have been accusations that it isn't a safe investment: https://bitcointalk.org/index.php?topic=1455773.new
OP, could you please link to any forums or sale site where people are willing to buy Mycelium crowdsale tokens for BTC?
If you can prove that in case you default, the lender can quickly get their money back, they'd be more willing to help.
OP, you see that no one is rushing to give you a loan, and you were told what the problem is. You may want to modify your request.