my experiences of ztr rims versus ghetto’d or rim-stripped mavic rims is that the stans have more of a ‘shelf’ (for want of a better word) which the tyre bead stretches onto all round.
Once the bead is on this shelf, it is quite tight, but when it is down in the channel, it is nice and loose. As long as you are aware of this, inflation can be done quite easily with a few tricks (such as inflating with a tube, then only unseating one side in order to remove the tube and re-inflate).
I’ve used various Conti and Maxxis tyres – not tubeless specific ones with just a single wrap of stans yellow tape, and they have been fine for the alps. I did manage to rip a Maxxis Ignitor in the pyrenees last year, but that was my own fault for not bothering to change from flimsy XC tyres on my first day out there. Single or dual-ply high-rollers and dual-ply minions have all been great.
The best tyres I’ve used have been Spesh 2bliss ones – specifically some Eskars on my girlfriends bike (with stans 355 rims), they inflated first time with a mini-pump, without even removing the valve core! – very very surprised, never had it so easy with my wheels!
I can’t speak for UST or LUST tyres on ztr rims because I haven’t tried them.
Dave