I use the AltGr key quite a lot and it hurts sometimes when I use it frequently. I think the spacebar is way to big. I understand that it should be easy to reach but you would have no problem using a spacebar that was 1/2 - 3/4 the normal size. I'm looking for a laptop where the spacebar is smaller so that the modifier keys are easier to access. I would also be interested in other keyboard layouts that makes modifier keys easier to use.
As mentioned in the comments its niche product. Even I've been looking for laptop with small spacebar
The best I could find is japanese laptops (with JIS layout) which have small spacebar (language can be changed to English and keyboard Type to ANSI)
you could have a look at JIS keyboard @ https://www.apple.com/jp/macbook-air/
Use Karabiner-Elements https://github.com/tekezo/Karabiner-Elements on macOS to map extra keys according to your convenience