It's true they do say they'll delete it after three months, but I and a few other people I know have had their accounts inactive for close to a year without losing their account. So you should be fine.
As for the PC question... I don't think there would be any need to buy the PC version, your account is not attached to any one console, so logging on your same account with a PC should be no problem.
=3
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FFXI forever!
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