An MB release is very specific in what it is: A music release/package in the exact way it and the contents were released. There’s not much wiggle room for ‘fan improvement’ to a release unfortunately (like rearranging the track order) - though if you released your edits as bootlegs you might be able to add those *
But the starting point is to add the existing as-is releases to MB anyway, maybe add an event and see how linking them to recordings and releases goes. Once you’ve done a bit you’ll get an idea of what data you can pull for scripting and how you might want to do it.
*If it’s widespread enough. This would be a good example of how MB represents releases quite specifically - your bootleg release date would be 2021. Then you’d have to set Picard to pull the original recording date or script something to take another value.