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by myself248 2100 days ago
That's pretty straightforward to DIY with the TMK firmware. Or even just with Autohotkey and your existing board; pick a key you don't use much (Caps Lock, right-Win, etc) and make it one of your meta keys.

Print your own keycap labels with Avery sheets for starters, and once you've got the layout nailed down, you can send off to have custom caps made by whatever process you like.