So - just to recap because I'm stupid beyond words:
1. We have a pattern of international wire transfers in large amounts from people with ADMITTEDLY no trustworthy contacts in their home country or countries. That's NEVER going to draw scrutiny or be subject to SAR reporting. Oh wait, it surely will be.
2. The OP will be removing large amounts of money from the regular financial channels and then literally mailing physical bitcoin wallets. I'm sure the full value will be declared
and there won't ever be anything lost in the mail that would have to be explained to his friends, who will understand perfectly.
3. The OP's friends would definitely be honest if the source of these funds were anything but above board, because he could be really burned if wasn't since knowledge of the source of funds or even specific intent isn't elements of a money laundering prosecution or forfeiture action - which of course could go after his own co-mingled funds. Being a dupe isn't defense.
4. And hopefully this highly secretive cryptocurrency isn't going to wind up tied to anything illegal, nefarious or god forbid terroristic. What with him being the last named ledger entry using his own coinbase account... But these are friends so this is a good mitigation of a serious risk.