Yes,.
BAIN should be able to scan bsa and compare to what in data directory and let you know what is going to conflict, unlike OBMM which cannot scan a bsa and compare to data directory and report.
Correct You can NOT use any of Safer Roads plugin with any of spawn rate plugins. That includes FCOM Safer Roads will not work with fcom spawn rate plugins either. Even with bash it still does not work.
Safer Roads plugin only works with default spawn rate.
The only way to make them work is to merge safer roads feature into spawn rate plugin itself. Which is easy with tes4edit. You just copy load up both safe roads and spawn rate plugin and copy % chance of none from safer roads into same leveledlist that is used in spawn rate plugins. And you have a spawn rate plugin with safe roads.