Yeah Glyder 2 saves everything locally so you are actually in a good spot even without using tools like Satella
For older iOS like 3.x the best way is usually editing the save file or using a modded IPA but like you said no one has made one for this game yet
Your method of buying the IAPs on a newer device and moving the save file back to the old one is probably the best and cleanest solution
It is a bit of a workaround but it works because the unlocks are saved in the game data not tied to the device or iOS version
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Aizen_'s post in Is there a way to crack in-app purchases for an old, OLD iOS? was marked as the answer