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This looks like the standard AZERTY layout. Alt Gr accesses the blue characters.
It's in the same place on extended AZERTY keyboards
[EDIT] I'm thinking that's going to be a pain considering how often you'd need to use the square brackets for brush sizing, but there are several options. A Wacom Intuos (or whatever they are calling it this week) can change brush size with the Express Wheel, and indeed, can be programmed to output any character.
You could use a Gaming Mouse like the Razer Naga which has 12 programmable buttons. You could set two keys to adjust brush size.
You could change your keyboard. I use a QWERTY Logitech G910 which has nine G keys in three banks, so 27 in all. These are context sensitive, so can be set to different functions for different applications.
The other option is a Gaming keyboard, which is an additional keyboard on which every key is programmable with keystrokes or macros. I have just ordered a Razer Orbweaver that has 20 programmable keys plus an 8 way thumb switch and two further switches/buttons. The button above the thumb switch is used to switch between any os as many profiles as you want to set up.
Thank you Trevor for all your nice ideas / alternatives. But it's hard to think that there's no other way I can't use those two keys as is within Photoshop without having to acquire other stuffs.