Well I can understand  the right corner you can be and since you're a bitcoin  maximalist, I really don't need to begin preaching the benefits and importance of bitcoin  to you as I believe  you're already conversant with them.
I dont know of the bond you mentioned and this is the first time I'm hearing of it but I think it also sound great but what are the criteria for drawing the raffle and picking the winner and if its truly fair, then I don't mind saying that you keep giving it a shot but as for the £50 I think you can simply just keep  pushing  the winnings into bitcoin  since you also talked about diversifying.