Est-ce que tu composes les combinaisons AltGR: ~ # { [ | ` \ ^ @ ] } sans regarder ton clavier et ou sans briser ta posture?
I chime in since this may interest you: I used to touch-type in AZERTY a long time ago (now I'm QWERTY only) and I did touch-type every single key, including all the AltGr combination and including the function keys too. Actually I've worked on an "otaku" IBM Model M for years (which a blank keys, without any writing on them).
The only way to be able to touch-type AltGr (when it's at the right of your spacebar -- not if you've remapped it somewhere else) + all the combo is to hit AltGr with your right-thumb.
For ~, # { and [ there's no real issue: that's 2,3,4 and 5 + AltGr... That's easy to reach (you use your right-hand to do AltGr and your left one for the combo).
Then | ` \ ^ @ ] and } can be touch-typed too, as long as you use your right-thumb to hit AltGr. I'm not going to say that's it's "convenient" but, to me, if you want to type fast you can't hunt & peck and must touch-type.
The problem if you try to hit AltGr with any other finger than your right thumb is that then there are keys which you cannot reach anymore with the "correct" finger. For example if you touch-type '0' with your pinky and 'à' (that would be left-shift + '0') with your pinky too, it makes no sense to then hit that same physical key to produce @ with anything else than your pinky (IIRC in french AZERTY 0, à and @ are all done with the '0' key). If you want to use another finger than your pinky to hit AltGr, then it's going to be very hard to reach 0 with your pinky. Same problem with the other fingers, besides your right thumb.
So on AZERTY you either use your right-thumb to hit AltGr or you accept that you'll never be touch-typing some characters. I was touch-typing everything (and I still am) so I got "used" to use nothing but my thumbs to hit Alt and AltGr.
For many reasons I decided years ago to switch to QWERTY: # { [ | \ being on AltGr being one of the reason (I don't care much about ']', '}' and ')' in these days and age of editors with autoclosing parentheses). Another reason is that both left-**** and enter are narrower on AZERTY: making them way more painful to reach (your fingers need to travel more up to the point where your hands move slightly more than on a QWERTY keyboard to reach these two keys and that quickly adds up). Another reason is the bigger choice of ANSI keyboards / keycaps set. So I dropped ISO and turned to ANSI.
So now I'm exclusively using QWERTY (but with an Alt that acts as an additional modifier, giving me arrow keys on {IJKL}, Home, End, Escape and all the french characters conveniently located). I do still touch-type everything.
The "thumbs to press Alt's" is the reason I'm now considering 60% keyboards with smaller spacebar like the japanese HHKB or the KBT Pure Pro (or maybe the Filco minila). I really wish more manufacturers would create keyboards with tinier spacebars: it's pretty much an accepted in the ergonomic-keyboard world that thumbs are very useful to hit modifiers. Yet for "regular" keyboards we're pretty much stuck with 6x, 7x and bigger spacebars