Well if you do sign up with Paypal and use that, then the only details someone else gets is your full name, the rest of the contact information is kept by paypal. I don't think Kraftzone is going to be accepting anonymous payments like Bitcoins etc anytime soon.
If you want to talk to me about some other way of donating though by all means pm me, generally though I keep it strictly to paypal.
http://store.steampowered.com accepts visa and you can buy a game as gift and send that, I might be willing to accept just ask me first.