Hi, TODDLT. We noticed you are, and wanted to say thank you for, considering Seagate drives. We wanted to start off by saying that, in the end, nobody can tell you exactly which drives to buy for your needs, and you're the only one who can make that decision.
It looks like you've been doing some pretty solid research on the differences between the BarraCuda, IronWolf, and SkyHawk series hard drives. You're correct in that the basic breakdown is that BarraCuda is for general PC and gaming applications, IronWolf is optimized for NAS and designed to be constantly spinning and ready for quick access to data, and SkyHawk is designed for surveillance, or efficiently writing blocks of high-detailed, intensive data most of the time, with limited read access. IronWolf drives are designed to be constantly ready for quick access at a moment's notice for a variety of users in a NAS application.
The bottom line is that, yes you could technically run any of these compatible drive types and it would somewhat work. However, to get the most efficient performance and the longest life out of your investment, it is best to use drives that are specifically designed for the purpose in which they're going to be used. Here is a useful video on the subject.
You're probably right that, for the application you've described, the SkyHawk drive line is not going to be the most efficient use of your resources here. I would look at the BarraCuda data sheets and IronWolf data sheets (you can feel free to look at the others as well), compare them to what your estimated needs, priorities, etc. might be, and then draw your conclusions about which price point and match you feel most comfortable with here. Please feel free to reach out if you have any questions!