Sorry a bit late to this but a really good site for France with GPX files is
Les plus belles randos VTT et VAE pour votre GPS
My area is SW France but I think it has trails all over the country.
I've bought a lot from Wiggle and CRC in the past..the go to really inc the 12%, and they sent Haribos that my wife liked.
Anyone got a go to alternative, in the UK ?
If you are the original owner I think the bearings are guaranteed for life so Whyte may send new ones.....but you will have to fit them...or my LBS did for small charge.
Just one point about the Epix v the Fenix. The Fenix is rated at 50 mts+ so great for snorkelling and even scuba diving. The Epic is surface swimming only which seems a bit of a downgrade for such an expensive watch. I know it won't affect MTB-ers (or shouldn't) but everyone goes on holiday !
The battery life is the archillies heel of the Apple watch and not a solution but have you tried Settings>Battery>Low power mode. It might help a bit....although the Garmin watches do seem good!
I bought these a couple of months ago.
I have been off the bike since then and only a short test but seem to work if you can get the trousers over them.
https://www.endurasport.com/mt500-burner-flat-waterproof-shoe-black/14876424.html
As redders said but I think the chainring may have a slightly different profile and worth getting complete with the whole group set.
Same cranks though!