[newbie] Is it possible to avoid cluttering the release page with all work relationships?

Looks pretty good. I would suggest changing the recording artist from the composer to the performers. Note that this is not the same as the track artist, which is correctly set as composer. One of the irritations with the rather anachronistic handling of classical music by MB is that this inconsistency exists and has to be manually fixed. The quickest way to do it is to use loujine’s script: https://github.com/loujine/musicbrainz-scripts - you need the one entitled “Replace associated recording artist from a Release page”. You need to install Tampermonkey or equivalent in your browser first. Then click “show checkboxes”, “select all” and “replace selected artists” in that order.
See The Classical Editor Toolbox for plenty of useful tips.