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Different plants have different salt tolerances. Some google searching might yield results. Generally speaking though you can salt your tank incrementally until you get an adverses reaction by your plants, then do a water change to reduce it again.
I bet if you googled ich medication and planted tanks you would find something too.
Most plants will be fine at those temps. I do not actually know of any fw plants that can't handle those temps (and even more). I have treated for ich successfully with just heat before. Treat asap though, because it is harder to get rid of once it gets completely established.
Just crank the temp right up. By the time the heater heats the water the fish will be use to it. Oh and I found an increase in the ich for the first 3-4 days then it started to fall off the fish. After 10 days it was gone so I kep the temp up for a full two weeks to be on the safe side.
Keep the treatment going for a week after the symptoms disappear. Ich has multiple life stages and you need to kill them all. Just because you con't see it doesn't mean it isn't there.