The tripod you propose is a perfectly good choice, and a great price point for an amateur/enthusiast.
I don't know anything about the ballhead you're evaluating, but the Anvil 30 by RRS (or the Leofoto knockoffs) are the gold standard for shooting from a tripod. Alternatively, you can just plop a support bag on top of the tripod head, many folks do that in competition anyway (both NRL Hunter and PRS); it's often more stable than clipped in, and can be just as fast depending on the scenario. I know you're not talking about competition, I just provide that info from the perspective of "If it's good enough for those guys, it's good enough for just about anybody."
Clipped in has the advantage that you can just leave the rifle sitting on the tripod while you interact with it, whether it's cleaning, adjusting/mounting/testing optics, troubleshooting function, or just shooting.
I'm not sure why you hate the concept of ARCA, unless it's just the cost of converting. If you're going to shoot from a tripod, especially clipped in, you should be using an ARCA rail that is at least long enough to give you full adjustment across your desired range of reach, from the buttpad to the support hand at the tripod apex. Using a Picatinny rail will really hamper your ability to get your body positioned properly behind the tripod, and would make you less stable if you go the support bag route. Personally I think you will be much better served by a full-length ARCA, it results in better stability on a support bag anyway if you choose not to clip in.