A couple of important points to help you out:
1) You should be able to choose Paypal as an option to pay. Paypal is a great solutionf or somebody like you, because you can just transfer money to your Paypal account to top it up, and pay from there.
2) If/when 30 Years War gets released on Steam, you will be able to use the serial number you receive from AGEOD, to get yourself a Steam key for free - so you will be able to add the game to your Steam library.
Ergo, no reason to wait.
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