Your bioload looks good. A lot of people will tell you that the bioload of invertebrates is negligible, and I tend to agree. If you're keeping up with maintenance you can get away with much, much more than that. One thing about Thai micro crabs: you will probably add a hundred of them and never see a thing. They're incredibly reclusive.
Snails are tricky. I personally don't like them at all since they always find their way into every aquarium I've ever set up. With that in mind I suggest zebra nerites since they won't proliferate. The other option is to start without snails. Then when you're plagued by little ramshorn snails add assassin snails to clear them out.
For feeding, most garden variety shrimp will subsist on biofilm and algae. Mine do at least. I add shrimp to well-established tanks, and they never seem to go after shrimp pellets.
When it comes to plants, I say stay away from the lace leaf. It's painfully slow-growing, goes dormant randomly, and if it thrives there's no way you can fit it in a 6-gallon tank anyway. Also I've had HC cuba in my tank for a year and it takes some work to make it look good. Contrary to popular belief it grows pretty well without CO2 injection, but it's not exactly easy to grow. It's algae-proof and fills in as a really dense carpet for about 6 months, but then you have to start trimming it aggressively. For a truly low-maintenance tank I suggest a small Bacopa species or some other stem plant to your liking mixed with the slow-growing stuff. The stem plant sucks up nutrients and fills in the tank, and are really easy to trim.
As for moving a planted tank, it's really hard. I've never moved one between cities. Since you don't have any delicate livestock, I suggest you get a friend to take it for the summer. An all-invert tank like that can be fed once a week and just needs good light and water changes.