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60% keyboard

My cheap 100% keyboard was a bit clapped out so I got a ducky one 2 mini, a 60% keyboard. At some point in my past I've had a compact-ish typematrix orthonormal keyboard, but that died pretty quick, it didn't seem to bring much benefits and I'd rather stick with a more conventional layout so that switching between keyboards is not too difficult.

New keyboard

I've rebound Capslock with L_Ctrl, and moved the Fn key next to the space bar, which I'm going to need to reach the missing 40%:

|Esc|                            |BSpace|
|Tab|                               | \ |
|Ctr|                             |Enter|
|Shift|                           |Shift|
|Ctr|Met|Alt|   Space    |Fn|Alt|Met|Ctr|

My main uses will be typing and coding, and I wanted to get something with a small footprint so that I have more desk space for my stylus and mouse.

While I can use my thumb to hold Fn and access most keys, ideally I would be able to additionally bind Fn to the L_Ctrl. Unfortunately the keyboard only allows you to swap positions of keys on the bottom row, not have duplicates...

While I use R_Shift, and occasionally R_Alt (altgr-intl), I never use R_Meta or R_Ctrl. Similarly, I expect to use L_Ctrl less and less as I get more comfortable with L_Ctrl in the Capslock place. But so far I don't have any ideas what to bind these three keys to so that they would be useful.

Things to consider

If you are thinking about a 60% keyboard like this, some things to consider:

While tilde can be accessed with a Shift-Esc, backtick requires pressing Fn-Esc.
Delete is Fn-BSpace.
Navigation arrows, PgUp, PgDown, Home and End are Fn with a group of keys on the right of the keyboard: i, k, j, l, p, ;, [, '. I can use my thumb for Fn to access these without much trouble. Currently I'm slower than dedicated keys for these, but in the long run it should be faster.
The mouse scroll wheel emulation, Fn-r and Fn-f is a nice feature.
The F1, F2, ... keys are Fn-1, Fn-2, ... I typically just use them in infrequent vim command bindings, but I imaging this would be awkward for some software where you'll also be using a mouse, e.g., shortcuts in Libreoffice.

Still to sort out

What to do with L_Ctrl, R_Ctrl, R_Meta so they are useful?
Backspace in general is a huge stretch. I'd like to be able to use the vim i_CTRL-h alternative to backspace to work outside vim!