If you read up on Sulfite free wine, you will find out:
1) All wines have a natural level of sulfites, so the issue is added sulfites.
2) The shelf life of non-sulfite added wine is much shorter (9 months?)
3) The sulfites in kits (home made wines) tends to be much lower than commercial wine.
4) Commercial wineries with no added sulfites usually put their wines through a pasteurization process.
5) It is very difficult to work around k-meta if you plan on backsweetening the wine.
I suggest the following test with your cheap wine kit:
1) skip the k-meta, and clear the wine.
2) When you are going to bottle, bottle 1/2 the wine. Then add 1/2 of the k-meta, and bottle the rest.