This is fascinating. It's like a riddle or a Cold War spy game. How do you pay someone in the most indirect way possible?
Cash is so 20th century. It's yucky. Millions of people touch it with their bare unwashed public bathroom hands, sit down and sweat on it for years for goodness sake. Egregious. Suppose you sent Ikey $20 USD, all the way to England. You're not sending charity; you're sending him a chore. After he drives to a bank in order to convert it to pounds sterling, he'd have to convert the pounds into whatever digital currency is convenient to finally add what's left to the Solus project pool. In other words, he'd have to physically convert a bill, bank the pounds, then return home (subtract the petrol money and time here) in order to donate at most £15.12 from his own bank account to the Solus Patreon, which you could've done yourself with a few clicks to begin with. That's the reason.
Now, what you could do is Western Union. This eliminates the currency conversion step. Now, assuming Ikey wants to keep his home address private, you could hire either Jason Statham, or a poor cockney messenger boy from Charles Dickens, to hand deliver the Western Union pounds at a convenient secret location previously agreed upon by both parties. As long as you account for overhead in the donation, the only remaining problem with this plan is Ikey's wasted time.
Maybe an air drop over London? Oooh, a messenger pidgeon!