I did some check this morning
Acrylic case :
I can confirm that the t21 from sternkreuz and an acrylic middle case will work, no problem here
For the t21 from Clark or other, if the fitment is not tight between the crystal and the middle case without the bezel, the bezel will not compensate the fitment trouble, it's different on each case I have (3 acrylic case) 2 pass and 1 have the bezel loose, all bezel I have are less Than 30.6mm diameter... I cannot guarantee that it will work as the acrylic middle case seem to have variation on this particular diameter
The t22 I have (Clark) and the bezel work on each acrylic case, the crystal is less loose than the t21
For this trouble, I can supply few t22 domed look like lobtime one, i ve reserved the stock at my local shop, it remain him 8 pieces, tell me if you want one, but it need a little adjustment as the crystal I more 30.65mm
Here this crystal mount on an acrylic case
Saphire middle case:
T21 all type, no problem
T22 no problem
T22 domed little rework on the inner diameter of the bezel, it s too tight
So in few words, the acrylic middle case is not constant on the fitment crystal diameter, I have all my bezel less than 30.6mm, with the sternkreuz crystal, no problem, but other brand need a check, if the crystal is loose on your case before assembly, its possible that it will not work properly. The inner diameter on the bezel I have for t21 Is constant at 30.58mm.
T22 seem smaller on the fitment diameter and compensate the smaller diameter on the acrylic middle case.
Check on your side I will send you pm to answer you to confirm, send me your adress and I can prepare some packet this week end.
For the t22 domed, 1 per person, as no stock at the shop, and the guy is not clear on the restock possibility...