I’m using an adapted version of this, with a 12g tote from Lowes rather than a bucket and a bit of kelp powder rather than hydro nutrients. It seems to be working fairly well as far as keeping the cuts alive; some strains have had 100% success very quickly, others still haven’t gone anywhere after a month. I probably did some damage by moving them into my veg tent though, far too much light in there. Kelp has naturally-occurring IAA, the active ingredient in most rooting gels, so it’ll keep them reasonably well fed and should promote rooting just as well, but not if they’re busy eating themselves trying to keep up with the lights. 
What makes me think it was probably user error (too much light) is that the cuttings are even still alive after a month or more. 
Here’s the latest picture; the GG4 in the back of the center row looks perfectly healthy, but it’s been in there since New Year’s Eve and still doesn’t have roots. The other GG4 cutting had roots after 2 weeks, but then I moved them into the veg tent… at that point I think the one with roots continued to grow them while using them to uptake nutrients, while the one without roots struggled to keep up with the nutrient demands from the powerful light.
