Follow-up to my post
here... turns out what I was looking for was already being sold by MTEC - a replacement clutch spring. Didn't see much reviews for it but it wasn't expensive, so what the hell.
MTEC on the left, stock on the right.
They are the same free length but the compression rates are different - I can compress the MTEC spring with my hands but it's a lot more difficult on the stock spring. Install was easy, I followed MTEC's guide
here.
Impressions:
Basically what you would expect - it's a compromise between stock and complete spring removal. Provides a bit more weight than stock but not as much as complete removal. It also eliminates the free-play as shown in my poorly animated gifs:
No spring:

MTEC spring:
Verdict:
If I were to do it again, I'd just leave it springless. Like others have said, pedal free-play is a non-issue and while I had the spring out I quickly got used to it. That being said, the clutch feel is still pretty good, better than stock. So I'll leave it in for now, I'm pretty adaptable.
This would also benefit those who don't like the stock light clutch feel but are often in stop-and-go traffic, and/or have chicken legs. Don't skip leg day, bros.
Update 05/12/2015:
After driving with the MTEC spring for a couple of weeks, I'm happy with the pedal feel and don't think my clutch requires any further adjustment. Very worthwhile mod.
My current settings:
- MTEC clutch spring
- clutch height adjustment to 5mm above brake pedal (I think.. will double check)
- stock slave cylinder