I can definitely understand that.

To be honest, I don't know how a post RotS prequel would work without further deteriorating the OT reveals... but then again, it's fun to think about. Here's my idea for said project:

Perhaps Vader, accompanied by Tarkin and a small band of troops are sent to seek out and kill one of the few remaining Jedi, hidden on Alderaan. Bail Organa has been hiding him, but can not be prosecuted/imprisoned for it due to the Empire's continued recognition of the rights of Royalty to govern their people (if individual planetary Sovereignty were seized, they would face a much larger scale rebellion).

Leia (10 or 12) somehow gets mixed up in it - perhaps the hidden jedi could be her private tutor. He was sent there to train her, but was instructed not to do so until he was sure she would not stray to the dark side like Anakin. He remained unsure, as she was prone to impassioned outbursts and other such things. The film plays out on Alderaan, with the occasional off world trip just to keep the "Star" in Star Wars. The Jedi is caught in the end, with ensuing Vader/Jedi lightsaber battle. This helps spark the fire of Rebellion. Bail contacts Mon Mothma and tells her it is time. The film could end with the shot of Vader, Tarkin, and the Emperor from the end of RotS, showing the start of the construction of the Death Star.