Your method accomplishes essentially the same thing as what I suggested; but the indoor method, I suggested is somewhat quicker.
Very true. You gain several months to a year of growth, depending on when you sow and manipulate temperature.
I just read the original question as being from someone struggling when most seeds here have produced high percentages of seedlings.
It is a "weird" strategy though - root this year, leaf next.
Maybe worth a mention - true seed is uncommon on many plants and I have had batches of what appear to be good seed from society seed distributions (not just SRGC), that totally fail to germinate. For anyone not familiar with viable true seed, it is generally large - 8mm and more across, usually black and shiny, and very hard.
