If u do the rockwool method u prob wanna sprout seed in rockwool outside the pot cuz pretty sure amount of water they need would have the soil under and around the block totally soggy so by time roots hit edge of cube the growth would slow due to the excessive moisture! Sprouting first and then planting cube u can keep pot and good moisture level and added bonus if u have dynomyco or rootwise, great white, any of them powdered myco u can sprinkle down into hole before planting cube and that will help roots get going muy rapido!
Just a thought amigo