Suggest subjects and tags where required
To speed up and ease the deposit into HAL and OSF, it would be good to prefill those fields with some reasonable suggestions and let authors decide what to keep.
http://annif.org/ by the National Library of Finland can be used for this purpose and was in fact already experimentally used by Ari in JYU for the students' thesis deposit.
A simple approach is to just rely on the data and model they already have and map the YSO top subjets to ours (see spreadsheet with an initial map).
A more robust solution would be to actually download works from OSF and HAL and train Annif against the content of each subject, to create a custom "project".