For the past 3 years I’ve done the following remap Caps -> lctrl/esc, enter -> rctrl/enter, tab -> lalt/tab, backslash -> ralt/ backslash. Also have the physical right alt mapped to multi key/dead greek.

It works really well, and makes emacs much more comfortable to type in.

Downside is this keeps me locked to X11 and fighting the occasional app that reads the key codes directly.