I have plenty of thoughts. lol Honestly I have not watched your BTS videos yet from the events. I will do so now with much more interest. When you more of an abstraction few of us felt a strong desire to get to know models from another site that we haven't yet joined. None of us in here had any idea that we would have the privilege of meeting and interacting with you here on the forum.
It is a shock to me that you are not gay. lol Please know that regardless of that we are happy to claim you as an honorary member of the family.

Whether you identify as straight, bicurious, strictly gay for pay, or whatever. In hindsight though I had heard that alot of the models over there were straight. Though certainly not all of them are. I watched the whole episode of Tyra Banks' show for instance.
As for dealing with your family and your father in particular only you know his personality best to make the final decision. I will offer a few tidbits of advice to consider. There are at least two different things that you need to break to him. You need to decide whether you are going to come out to him as bisexual. If that label doesn't suit where you see yourself...for instance straight but gay for pay...then you need to have that thought out ahead of time. You also need to be prepared for the inevitable logical questions that he will have.
Then comes the matter of discussing the gay porn work. It would be so much better coming from you than a whispered conversation between your dad and a neighbor in the grocery store aisle. You don't want your family to find out from a total stranger.
As for how and when to tell him I would recommend telling him in a relaxed setting alone at home. Telling him in a public place like a restaurant might be very awkward. He will have a zillion questions. And you will want as few outside distractions as possible to thoughtfully formulate your answers. Your dad doesn't want to have to whisper questions to you for fear that people beside you might catch a few words and want to eavesdrop. If it doesn't go well at first you don't want a drive home together from a public place to be filled with total nervous silence. That would not be a good time for either of you. Add to that the fact that being in a public place would also give you plenty of excuses to chicken out. lol
From what I hear you saying though I believe that your dad loves you very much and vice versa. Be prepared to give him a week or two (or more) to process all of that if he needs the time. Overall though I have a very good feeling that this will turn out well for you. Good luck Rob.