Seriously? How many people do you imagine are out there with "a good boxing or wrestling or bjj background" that are out accosting people? There are only a couple of actual instances where you would be accosted by anyone, trained or not. One is if you were in a high crime area and looked like someone that could be easily robbed. With your size, as long as you maintain a good awareness of your surroundings, the odds of you being accosted in this manner is probably infinitesimal, and you should worry more about being struck by lightning. The second instance where you might be accosted is by a belligerent drunk or drug user. First, drunk or high folks are pretty easy to avoid fighting with, and those potential fights can usually be de-escalated with a little logic and humility. Given that fact that they are either drunk or high, they should be impaired enough to so that if you are forced to engage, any training you might have would be more than enough to overwhelm them. if you're truly worried about your personal safety, you would do far better to train in something to improve your situational awareness and skills in avoiding confrontation rather than worrying about actual fighting skills. There is a lot of information to be found on the internet. The unfortunate fact is that 99.9% of it is biased toward whatever the person writing it is selling. Your best way forward is to decide what you're really looking for in your training, then go out and get that. Wanting to train in order to win some nebulous idea of a "street fight" that will most likely never happen in any way, shape, or form is a Quixotic endeavor at best, and could be a waste of your time and effort.