AsNoriuanswered grow question 4y ago For veging and bringing micronutrients and bacterial fauna into your soil - yes.
But npk of worm castings is about 2-0-0.
You will need basic npk nutes with higher N for veg and higher PK for flowering.
Plus seedlings stems are very sensitive, can cause burning when you will be topuping.
I used as early as week 4 for top dress, but I feed extra ...
Think will it work only ...
But find recent Lex Blazer video on YouTube, he had grow with almost no feed and made time lapse for it.
Enjoy !