I realise it is not the Sega original I think we're talking about here but one source that might be relevant is still the Xbox version of Panzer Dragoon Orta (PDO).
I've just checked and the XB360 and more recently the Xbox One has been made backwards compatible with PDO and, I'd assume, allow you to unlock and play PD1 too. But you'd need to check that.
I know you said you do not have a Xbox but I'm assuming that meant an original Xbox. You might have a XB360 or Xbox One so the original Xbox PDO might still be the way to go.
