Hi, this is Helge from Wheelmap.org. We know those large change sets are annoying, my apologies! 
We are working on a major update which will improve the sync between OSM and Wheelmap. We found a way to abolish those large changesets and introduce individual changes (one change per changeset). However, getting this live is taking way longer than expected. This is very frustrating to us too, and we kindly ask to have a little more patience. Please check out this GitHub issue for more information and future updates: https://github.com/sozialhelden/wheelmap-frontend/issues/327
If you have more questions or feedback feel free to contact me here: helge@sozialhelden.de