I am now wondering if a combo of GA (or maybe auxin) and Ethylene may be good for seed sprouting.
When a seed sprout hits a rock in the soill it uses endogenous ethylene to get oround the rock.
Also…
Ethylene inhibits vegetative growth by restricting cell elongation
Ethylene promotes the breakdown of abscisic acid (ABA) and thus relieving ABA’s inhibition of gibberellic acid.
https://www.pnas.org/doi/10.1073/pnas.1717649115
Ethylene should inhibit root growth and encourage shoot growth. It should inhibit metabolism and stimulate photosynthesis. It also is known to stimulate the growth of root hairs, a method for increasing the surface area of the root and its absorption of oxygen for local use.
Here is a link to a thread I wrote about stress.
FYI… I did have some help with this.