These can be adapted many different ways. Some recipes include dates, some don't use as many plums, some use different spices and some add more sugar to the "dough".
I used my homemade dried plums so these were not as sticky as they would be if you use store bought dried plums. Rolling in sugar will help them not stick together. You can always add more nuts if they are far too sticky.
To make these vegan you can omit the honey and add a little water as needed to get the dough stick together, or use agave or even pure maple syrup would be delicious.
My recipe was inspired by Alton Brown and Back to Her Roots