I’d preface the work by stating how you define medieval and why your definition is both relevant and appropriate for your collection.

Put it at the beginning, preferably in bold type. Otherwise you’ll get pedants dismissing what looks to be a wonderful project merely because of silly prejudice.

See the many threads where “folk” “baroque” “traditional” and even “pop” not to mention “contemporary” have gone from interesting debate to silliness once the preconceived opinions of self styled music police come out to play.

Good luck with it. I’m working on the tunes behind Charles Wesley’s hymns at the moment. It’s the collating and discovery that counts, not the reception.