I have also never heard of using LSA as an analogue for the synthesis of LSD. I'm not going to sit here and check my brain on paper, but I'm reviewing it in my mind, and I don't think that it can be done without wasting a retared amount of energy in the process. If it could, then people would be doing it. Stick about 14 baby hawaiian woodrose seeds in your butt. You will like the trip just as much for 1000's of times less effort.
What Peach said about Ergotamine Tartrate bing hard to culture with any kind of consistency is absolutely true. I have synthesized LSD-25 several times. Both in a well equipped lab, directed by a "real" chemist, and several attempts myself in a moderately equipped lab. We always cultured the precursor ourselves. Almost every time, we failed chromo because there just was not enough ET in our culture to react. We ended up with very small measures of success only after we did 4 separate cultures in 100 petri dishes each. It was very time consuming, and not in any way worth it. Besides that, who among us has 400+ culture dishes in their private lab with the space and atmosphere to store it?