I'd be inclined to think that a parent so shallow as to judge a "female" teacher for having hairy legs is not going to hold a trans-male teacher in high regard, either. For that reason, I'm not sure full-time passing is going to be any easier for you where judgemental people are concerned. At that stage, a student may tell a parent that their teacher "used to be a woman" and you may get confronted about it. There are always going to be some who knew you pre-transition, so even if you look 100% male, information about your past is always accessible, even if only through rumours.
I'm not saying any of this to be discouraging. On the contrary, I'm offering an alternative perspective to consider that is actually intended to encourage you to just go ahead and be yourself and not worry about the hairy legs. It's possible you may be allowing your fear to hold you back. Yes, someone may say something that you fear will place your job in jeopardy. However, someone may just as easily say something later on in your transition that may do the same. Should you hold back because of it? Basically, this is all a matter of deciding when and where to draw the line. You, of course, are the only one that can decide what's best for you.
I realize you aren't asking for advice, so feel free to completely disregard this entire post. I have no way of knowing whether or not my opinion is at all relevant, since I'm not the one living under your circumstances and I don't have all the facts.