Dear Pr Flemisch,
I was wondering if auto-generated format-checked results files and figures from a push to a github repo (or other git management service and CI) could be a solution for participant wanting to ease the checking process/preview the formatted results.
For instance, here is a (quick and dirty) example leveraging github action tracking large data with git-lfs:
https://github.com/jafranc/gha-csp/
where with a main branch is admin-only mergeable and a develop branch into which the all sparse and dense from all case are then merged back after generation. Each combination case/data_type having its own separate branch.
Best,