As far as I've been reading, it is possible if Bitso retrieves the private key of the account. I'm in the same situation, I just entered my address into an ICO but the tokens will be distributed in a few hours and it seem that they won't be able to read the support ticket on time. Please update about the answer you receive from Bitso so I can follow the same process.

Good luck man

What link did they give to you? Ive tried to contact them several times and they just send me a google form that is supposedly going to be considered before the toke allocation. But as time passes I'm getting more and more nervous of being excluded from the process an of  losing my investment as the first address I provided is not ERC20 compatible.