Dave spent some time with lots of rustly moving things & bags of stuff hanging from his roller & yoga balls bouncing beside him & over his back, sometimes they'd balance on his back. Basically everything replicating movement & noise from above.
Dave's breeder names all his ponies after Marvel Cartoon characters. Dave is Darshill Banshee. I think that's so cool.
https://en.wikipedia.org/wiki/Banshee_(character)
Dave has a trim every 3 months. The trim is generally minimal, as he seems to do a good job on his own.
Don't give yourself a hard time, can you send your farrier some photos? I did this when we had to go a lot longer than normal in Lockdown & all was fine.