I used to think the same way. And that's how we used to do it. Back before we had good chrono's. I used to true my MV by getting BC's from Litz before he was a big deal. At that time BCs were more solid than velocity because of the chronos back then. Now, with our ability to measure and model, BCs are being put into more question. To the point AB is going around creating individual drag models for people using a common bullet. I attended a sniper conference and the former head of the FBI ballistic lab gave a demonstration of data he gathered by shooting over a Oehler System 88 showing how BCs weren't nearly as consistent as we used to think. Bullet to bullet out of the same gun. Out of two different guns.
Your two main variables are BC and Speed. You already know this obviously, everyone does. Not lecturing here. You can tweak one or the other to match your engine with DOPE. Or both at the same time. Typically, you'duse one of the two to anchor yourcurve and then tweak the one that is the most prone to being variable. So now, with some of the most accurate chronos we have out there, why wouldn't you use MV as the anchor and use BC to adjust the curve? The MV is the most likely to be accurate. You're correct, you can change whatever to get your engine read dope, so why tweak them randomly? Why not use a trusted agent? If I was in an adhoc, expedient environment and just needed it to agree I could absolutely randomly change the two randomly, but proceed that way as a norm?
Your BH is extremely quantifiable and easy to measure. You shouldn't have to be making random BH changes to get things to line up.
The way I do it is extremely easy. I zero and chrono at the same time with a MPA bayonet. I group for accuracy at 300 still using the bayonet. Then shoot at distance to confirm my data, still using the bayonet. I true the BC if they don't match. I've been using the same 105 Hybrid BC for the same lot of 3500 bullets for the last 18 mos. The same SK S+ G1 BC for two years. I do not use CDMs, I have found a few to not line up for me. The fact that they can go to matches and come up with different, individual, custom CDMs for people's individual guns kinda reinforce that for me.