Oh man, you weren't kidding. Part of me wants to print out some of these pages to use in my D&D game, somehow.

(Although, part of me is also uneasy with that idea - using someone's culture & heritage as set dressing, without paying it any of the actual respect it deserves. It would be just as easy to copy a few paragraphs from Wikipedia, & use a Star Trek font to make something look fantastical, which is something I've done in the past.)

No-one's going to mind in the slightest if you lift Gaelic type or script for a D&D setting. (If you start larding in corny or inaccurate Irish stereotypes as well then people might start to be offended and/or amused.) If it matters, the writing style is basically just a long-surviving regional variation of what was once a mainstream form of Latin script, anyway: https://en.wikipedia.org/wiki/Carolingian_minuscule#/media/F... . So its story is quite similar to the story of how blackletter hung on as the primary script family for German until roughly the same time in the 20th century.

Stop worrying. It truly doesn't matter. No culture deserves respect. You might respect one culture or another for some reason but if you don't, as in this case, then there's nothing to worry about.