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You can ask the Wales Project for help by tagging them in this post, or using this link to their project page to make contact with them.
https://www.wikitree.com/wiki/WikiTree-66
I went to https://www.wikitree.com/wiki/Category:Reliable_Sources_for_Pre-1700_Profiles to see if the project had a Reliable Sources page & found this page that might be of help:
https://www.wikitree.com/wiki/Space:Wales_Pre_1500_Resources (unfortunately, the link for Bartrum is no longer live)
freereg.org.uk also includes some records from Wales
I knew I should have bookmarked Stuart's post about where to find Bartrum online these days. Found it!
https://www.wikitree.com/g2g/1301779/cadair-website-no-longer-available
It gives a link to [this page], which has links to zip files with the charts. Keep in mind that Bartrum has generational problems and includes some leaps of faith rather than logic. The [Wales Pre-1500 Resources page] includes a link to Darrell Wolcott's discussion of cautions ([this article]) that is well worth the read.
Many of the resources on https://www.wikitree.com/wiki/Space:England_Project_Reliable_Sources will also be relevant for Wales they share a legal system and government which create many of the records we use.