There is no better solution than glue all your frames and send to high-end cine scanne like Lasergraphics Director, it will be quick, high resolution up to 10k, HDR, even fluid mount, cleaned professionally.
I don't think such negative comments are decent. I am working on a d.i.y. project of similar extent and can tell you that it's very easily possible to suddenly find yourself a year or so behind expectation.
Imagine you fry a part on your pcb and need to re-design everything (of course you want to include all accumulated improvements), order parts, solder it, assemble it into your existing hardware and do all the following modifications: that alone would cost you months of hard work. Likely you also have a family, a job, and many other things to do...
Please be patient and support this great idea of a scanner. Or help actively. But don't throw mud at those people!!!
There seems little mention here of IR scanning for dust and scratch removal. Maybe purists don't like it but it sure does make life simpler and most of the time it does a great job if the software is good. If only for that reason colour scanning is essential. Obviously IR doesn't work with classic B&W but that is why I use XP2.
Otherwise, a resolution approaching a real 5000 dpi, 135 and 120 up to 6x9, good density and fast. I'd also quite like to see Silverfast support, I know it has its detractors but (and this is a big but) once you have the full version with the separate HDR software and you are scanning raw and post processing it all starts to make sense. Yes there are still bugs and there is a steep learning curve but once you have got there it is great to use.