Rahahb

Recipes 

If it ain't broke, don't fix it. You want the scoby to have access to oxygen, hence the cloth/paper towel, cheesecloth, etc. instead of an airlock.

Using this method, you will get all the oxygen you need. No need to introduce an extra level of complexity to something as simple to make as kombucha.

And to the op, starsan should be fine in reasonable quantities.