I don't have any experience of cherries, but how about drying them?
I've made bottled apples with nothing in them at all except apples - their own sugar preserved them I suppose. I basically made apple sauce and they lasted over 2 years. in fact they were my daughter's weaning food, which felt great because I had bottled them when pregnant with her :)
Here's step by step instructions for cherries in sugar if you want' another go:
http://thefoody.com/mrsbpreserve/pcherries.html
This works for glaceing any fruit: (from 
http://www.recipelink.com)
Glace Fruits
1 1/2 pounds prepared fruit
2/3 cup sugar
1/2 cup light corn syrup
2 cups water
1 1/4 cups sugar
2 cups sugar
1 cup sugar
First Day: Combine the 2/3 cup sugar, 1/2 cup corn syrup, 2 cups water; add fruit. Heat to 180F on a candy thermometer. Remove from heat. Cool, cover and let stand at room temperature 18-24 hours.
Second day: Carefully remove fruit from syrup with a slotted spoon. Add 1 1/4 cups sugar to syrup and bring to a boil. Remove from heat. With a large metal spoon, skim foam from surface of syrup. Add fruit to syrup and heat to 180F. Remove from heat. Cool, cover and let stand at room temperature 18-24 hours.
Third day: Repeat process of second day, but use 2 cups sugar.
Fourth day: Repeat, but use 1 cup sugar.
After final standing time, remove fruit from syrup. Place in colander and rinse with cold water. Dry on drying trays at 120F - 140F until fruit is leathery and has no pockets of moisture. Drying time will be 1/4 that of fresh fruit because so much moisture is replaced by sugar.
Have fun!
SC x