How to migrate to SMWSQLStore3 without shell access?

From semantic-mediawiki.org

Hi, and sorry for the delay. Actually, I think you have to ask the good people for this, like Markus Krötzsch, ‎Jeroen De Dauw or Karsten Hoffmeyer. Using SMW 1.7.1, I don't actually have this issue.

16:08, 7 December 2012