the RTBS will happily munch shrimp, im not sure how long they live, but if you want to keep him then you will need more robust fish, as the cherry barbs arent getting bothered getting more of them would be a good route to go down, skunk loaches can be aggresive so id definately consider rehoming him if hes fighting with the RTBS, i can see you love your rtbs a lot, so work your stocking around that fish, have a look at some info on red tails, then decide from that what would be good to go with it, as i said im not great with stocking myself.
its about 1.8 dollars to 1 pound, pressurized co2 can be expensive but that link i posted to a fire extinguisher co2 kit makes it more affordable thats what i did, ebay is a good place to buy it.
moving the plants shouldnt harm them, aslong as they are kept wet, and given time to recover after, but it will probably be the only way you are gonna catch the kribs.