QMK, one of the keyboard configuration tools referenced by the article, has the "quick tap term" feature that handles this:

> When the user holds a key after tapping it, the tapping function is repeated by default, rather than activating the hold function. This allows keeping the ability to auto-repeat the tapping function of a dual-role key.

ref. https://github.com/qmk/qmk_firmware/blob/master/docs/tap_hol...

I use both space and backspace (in the caps lock position) as dual-function keys and find it very usable when I occasionally want to repeat-tap them.