Multi Sig wallets could be a way of hoDling the coins without the need to install new wallets.
Similarly a part public key generating a vanity wallet ie
1Loyceabc123etc... would be another way to go - even if the person generating the key is a participant, they can't benefit as only Loyce can install the generated key on his machine (for an alt coin under his control) - said key could be sent to a trusted escrow on the current
Recommended bitcointalk escrow services list created by
hedgy73 who only has to hold it for the 10/11/12/??? months and then forward it to Loyce on an agreed date 10/11/12/??? months hence.
Similarly, if one or more of the participants has one of the alt coins in the latest round they could provide a part public key, have a vanity wallet generated (which is held by the escrow) and at the end of the round the generated key is sent to them to send the alt coin to Loyce's exchange address (eg Cryptopia) for that alt coin who will then sell up and divvy out the funds. The loss to the group if that person walks away with the altcoins is they have only received their own share back
* - if Loyce doesn't receive their alt coins held then they don't get a cut of the rest of the group. QED.
* and we get to splash the Red Paint TM on their Trust Wall
Loyce would be buying the alt coins on an exchange, so he wouldn't be sending any alt coins to an address unless he was satisfied, the protections were in place ( part pub key and escrow holding part secret key etc)
For practicality sake, only one alt coin can be held by one participant per round.
Just suggestions, take them or leave them.