Went all-out for my first build. First new mechanical keyboard (I have an old Dell laying around). The only reason I went for one is that it’s now quite economical to build one compared to 10 years ago as I have a 3D printer now for about 5 years and there are many more switch options. My parts cost me about €60, I went with cheap keys. Now learning Colemak.

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It's those little things, like your ii shortcut, that make custom keyboards so great.
One keymap change I would suggest you at least experiment with would be duplicating your numpad on one, or both, of the primary halves.
Not having to move your hand to use it is a great improvement, from my experience.
Edit: You should cross-post this at r/HandwiredKeyboards.
For now I'm only using one layer, I already went with extra rows and column to ease my transition. First training the new layout and maybe further down the line I might look into implementing more layers.
So far, it seems that the US layout seems to work with my keymap, so next month when ordering a new computer, I'll order it with the QWERTY US layout! (I'm in an AZERTY country) Should save me some headaches when working with VMs
The majority of my "layered" items are duplicates of things I have elsewhere, like having layered arrows in addition to my dedicated ones, a layered numpad in addition to the number row, etc...
The keyboard is a Cosmos Keyboard with the Colemak-DH Matrix layout.
The switches are 'Holy Panda V2 55g' replicas with 'XDA PBT Keycaps Mac'. My numpad is a 'BigNum' which I built to practice first.
Not sure if it counts as a mod, but I've mapped the Colemak layout in QMK so I set my computer in Qwerty. Addionally, a ii gets converted to ij as it's a common character combination in Dutch.
It's a XDA full-profile keyboard with the current QMK firmware installed.