You certainly have support from me. I usually use a system somewhat like this using scoreboard and a twenty tick clock, and a few score detectors, but this would be better.
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Also take a look at this guide if you are requesting builders for a server/project.
Please note, if I deny a suggestion because it is already possible, then I mean it is already possible withing 10 command blocks (That do not spawn other command blocks) or up to 5 creations (Command blocks that spawn other command blocks) to make your suggestion.
If I critique your suggestion I am not hating on you. Learn the difference.
I support this idea 100%. It would make making redstone devices so much easier!
But just to clarify, it waits the allotted time, then outputs a comparator charge after the time is over?
If so, is it on that specific tick, or a tick after? (Like a 3, 2, 1! Or a 3, 2, 1, go! kind of deal.)
I don't feel that a command would be appropriate for this. A new redstone device (like the repeater or comparator) would be better suited for this. I support the function of the command but not the command itself.