I used burlap/sprout bags last winter,,,, to solve the ripped and dirty bag problem I drove a stake in the center of the coop floor,,, left a few inches more than the bags length exposed. Turn the bag inside out and placed it over the stake,,,this worked pretty well, they pick it clean and never did get it off and on the floor. I usually just rinsed the bags out and restarted with a new batch of seed.
I'm betting that if you sprouted in the bag, then turned the bag inside out and exposed the "mass" to light you might get greening, this would eliminate the daily rinsing and watering, worth a try. I'm planning on getting set up for sprouting in the next week or so for the winter, I'll give it a try and let ya know.
I rotated corn, oats, wheat, and boss,,,they don't sprout at the same speed so I just did them separate and used as a supplement.