Nice combination of ingredients simon04. When I decide to use a starter I sometimes use whey as opposed to sourdough hooch, mostly because of convenience, but I also like the sourness that they whey adds. Plus, I always have some plain yogurt with added lacto bacteria in the fridge, plus I really like the creamy result after the whey has been harvested.
I have also used Caldwell's vegetable starter when fermenting several different vegetables, and have been very pleased with the results, it is fool proof......but it does add an additional expense. They have done the research and testing for many years and have a proven track record in commercial fermenting.
But most of the time I just use a couple tablespoons of juice from an existing ferment stored in the fridge, and just enough salt to give the lacto bacteria time to get going.Unless I'm making kimchi or pickles and I want to retain some crunchiness.
When I looked at the pictures you posted, I can't tell how your airlock is attached to the lid or if there is an air tight grommet.
Also, The jar with the Pineapple blend has a lot of open space above the contents. The more space there is...allows more oxygen in the ferment vessel which can cause problems. Normally just an inch or so of space is recommended.
Good luck, I'll be interested in hearing how they come out....they sound tasty.
CM