i have no debts like you but 0.1btc is really a verry huge amount if converted to fiat on todays rate but it is only a dust to the giver .
nice signature you have by the way , it looks that you prepared for this moment eh ? no one will found out that he has a tons of btc if he will transact online , transacting offline with that amount is dangerous .
the people that he wants to transact are not just ordinary people but how possible for him to sell to those large comapnies ? it must be hard but selling on exchange is easy but only he cant sell all at once .
Following that argument, there's no safe place for him as the amount of his assets is really huge enough to attract interest from all different kind of people, (hackers, scammers and all illegal doers and a like.)
Transacting offline with that huge amount of money, better to set up the deal inside the bank and have someone who you really trust to guard you though there's always bad case scenarios that may happened along the deal, better to sell it out separately deal with the
transaction fees just don't let your guard down as you able to keep the huge amount for 12 years just keep doing your security thing or better to enhance more.