US-International keyboard layout with AltGr (Right Alt) dead keys.
This layout simply moves all dead keys to the AltGr layer, and eliminates some other minor annoyances (e.g., ç/Ç now on its logical C key).
This MSKLC implementation is targeted towards more 'conservative' users (meeting basic needs).
Note that it only has minimal differences from 'US-International' to achieve the desired results.
=> Blue keys : dead keys in combination with AltGr (+ Shift).
For a more in-depth (or advanced) approach, please also see :
UltimateKEYS : https://github.com/pieter-degroote/UltimateKEYS
UltimateKEYS Core : https://github.com/pieter-degroote/UltimateKEYS-core
Website : https://pieter-degroote.github.io/