Again, safer & "green" products are in great demand, only problem is science is having a hard time finding products that both "PRODUCE" & are "SAFE" Believe me, I work in the finishing industry & spray @ 20 gallons of finish a week, I go to industry tradeshows, meet with all the major reps & they are hastily looking to meet that demand, unfortunately there is currently a trade-off in performance.
Actually, the Proprionate dip is one of the SAFEST topcoats used here simply because it's reduced in Acetone which has been deemed HAPS & VOC compliant by the EPA. Acetone is also the main reducer used in many of the LEEDS compliant water based finishes. Don't misquote me, it does contain dangerous compounds but the parts per million were low enough to pass.
The issue here seems to be concern for safe application. so you need to protect yourself & your area accordingly, which I see most do here. The majority of the builders here want a product (along with a topcoat) that is superior to whats available on the store pegs & in my opinion, you wont get that with a non-toxic product.