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Sorry, wasn't clear on what you wanted. PIPP won't de-rotate, but will give you a better registered set to work off.
When processing the venus transit I ended up having to do lots of batches (for solar I'm using a white light filter on a 500mm lens so I hand hold and burst the shots). So I had lots of shots taken within a second or two I could align/stack/process to bring out detail...rinse and repeat at intervals for the event to end up with a reduced set (but higher quality) and then would measure the angle between two sunspots in each to derotate.
It's a shame the sun doesnt come with a nice lat/long grid and axis pole sticking out of it to help alignment. You could also use the timestamps of your shots and something like stellarium to tell you the tilt of the sun at the time of shot. The EXIF data should record to the second (maybe less) but you may need a, EXIF reader tool to see it....take a reference photo now and compare the clock time of the camera to real time and see how far its out. So time plus and astronomy app should give you position/rotation info for the sun.
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