2 months ago I made the exact same deal BloodyRookie is offering you, only with a different team member. I don't see any problem in trusting a core team member to send you the rewards from running a node (and every tx is publicly available, anyone can check where the coins are being sent).
And if you have a life that allows you to travel so much, the electricity cost to keep a computer running at home shouldn't really be an issue. Asking someone to sell you XEM below market price seems completely unreasonable to me. If they make 10x profit, that's their reward for risking and investing at the right time. On the other hand, how could anyone trust you wouldn't sell the XEM immediately for a profit and disappear?
If you want to help this project take off and you're happy with whatever rewards come from the Supernodes, then imo the simplest solution is to accept the offer. I really don't see any need for complicating things using multisig accounts.