Not all lumpia wrappers are vegan. Some have eggs. Double check by reading the ingredients list. You may find lumpia wrappers at Asian grocery stores.
To prevent the lumpia wrapper from drying, place a clean, damp paper towel or cloth on top during the rolling process.
Make sure you add the cornstarch directly to the vegetables. Do NOT mix the starch with water before adding to the mix. Doing so will tear up the wrapper.
If you're feeding only a few people, cut back the ingredients serving in half. Or wrap all 50 pieces and store them in the freezer. The next time you want an instant meal, just grab the frozen lumpia and deep fry.