Yes, you are fortunate. My choices are quite limited compared to yours with absolutely no PTA signal or cell signal.Netflix is losing Friends and The Office and will likely continue to lose "bigger" shows over time as the major networking spin up their own streaming services and move them there. Netflix-developed content largely sucks.
I get the major networks via antenna, so I can survive just fine without subscriptions like CBS All Access (which is insanely priced, IMHO).
Seal Team can be streamed for free from CBS.com, you just need to wait for it to appear. I don't know about Bull.
I've also found that you can stream shows on an Android phone (bear with me on this) for free that you would normally need a CBS All Access subscription for. If you have an Android TV, stream the show on your phone and "cast" it to your TV. It actually looks ok and you don't have to pay the subscription cost.
I have the cheap Hulu as I took advantage of the $.99/month offer for Black Friday last year. It will revert to its regular price in a few months, and I don't know that I will keep it. I'm pretty sick of what's on Netflix and will likely dump that as well (possibly coming back for a couple of months per year to binge watch and catch up on shows) as the only content I'm currently interested in is In The Dark.
Like I said... I get the major stuff off of OTA antennas. So, I am fortunate to have a lot of choices without subscription costs. If I had to subscribe to something, I would probably give YouTubeTV a pretty serious look.
My plan for Bull and Seal Team are just as you say - when the shows are over the spring of 2020 I will just subscribe for one month and watch them then.
For now I have enough to watch on Netflix and Hulu to keep them. I don’t mind paying a fee to watch shows without commercials as I outright refuse to do so with.