How about something like this?
Instead of having your formula color then deal with colorings etc. Have it do some other output on double click, and base your other formulas off that. That way, it can auto-populate as you wanted.
I used simple formulas based on it populating the F column with "Completed" once you double clicked the cell in E2 (pretty sure you don't need help making that change in your code).
I used conditional formatting in the E column with this formula:
Then a simple IF statement in the D column based on the "Completed" being entered.
If I understand your end goal correctly, you could have it populate the D column with "Completed" and just use conditional formatting based on that, then have your other formulas based on that instead of a number (text is just as easy, right?)
In that case, you would instead use:
and be capable of simultaneously applying to all your cells at once.
Hope that helps.
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