I have a pair of decently worn Nike Dragonflies from last track season that I probably won’t race in next season. Would it be worth it to wear them in my xc races? The rule in California is no spikes for xc so I would wear blanks. Would just the plastic bottom of the spike plate be enough grip for grass/dirt courses? Would be worth my time to get rubber outsole material and glue it to the bottom for courses with hard pack dirt/pavement?