No.

1- NP can summon 2 treants = Max 4 souls.
2- Wasting a lot of time to go to mid tower etc. go to bottom rune and kill them using roshan and secure rune instead.
3- Too much time investment for not being worth the time.
4- If you have a good sf, there will be no problem getting at least 4-6 souls first wave considering you can block properly. etc.


Sorry, not viable by any means.