the gourami's and betta could potentially be a problem. think everyone else is ok. if you do go for it make sure you have plenty of hiding places for them, get them as big as you can and be prepared with a plan B if it doesn't work out.
Agreed, we don't have a couple Amano Shrimp in our 5 gallon Betta tank for this reason. We do have Dwarf Gouramis in or 30 gallon with Amano Shrimp and they don't pay any attention to them.
Even though your Gouramis are larger than ours I would THINK that it would be okay to house them together as long as you have plenty of hiding spaces and it's well planted.