I see you’re looking for Northern accent, so this doesn’t apply to you - but just as an inspiration:
besides SSiW (that as you’ll certainly know contains some of those words in the Challenges+old courses Lessons), I’m using songs to learn pronunciation, and mostly songs by a band called Datblygu.
I had a quick look at the list and (apart from the misleading details Siaron pointed out), of the first 300 words only about 15 are not present in their songs.
This means I can listen to them (and many more of the remaining 700) as many time as I like, pronounced by native South Walian(s) and in full sentences too.
And although verses sometimes do not match everyday language, it still seems better than words all by themselves.
Of course this isn’t meant to dissuade @Novem from recording all the words in @Breandan’s list if he enjoys that! 
Just saying, maybe with a little help from those who know where to find a wider selection of lyrics and from a wider selection of artists…I think it’s quite a useful trick!
p.s. @siaronjames BTW I like Meic Stevens accent too, so now I know you have pretty good connections, thanks to the Advanced Content 
… if you have any hints in this sense…