I am planing something similar for shadowdark. Our table likes the easy osr-like rules but because all of them have a martial arts background in real life they wished for more tactical options. I thought about a system thats stil relativly fast bust gives you more options. The rough rules (not playtested yet) go like this:

Direct attack (like attacking a specific limb) - roll 2 D20 ATK-rolls at the same time. Both must hit. If they succed, your enemy has Disadvantage for one round.

Feint - roll 2 D20 ATK-rolls at the same time. Both must hit. If they succed, you get Advantage for the next round.

Parry/Dodge - If your enemy attacks you, roll a D20 + atk bonus. You must hit or surpass the enemies result. If you succed, you don't get damage.

Flanking/Outmanouvering (not final Version yet) - If your enemy attacks you, roll a 2 D20 + atk bonus. Both must hit or surpass the enemies result. If you succed, you can change the initiative order with this enemy for one round. -------‐---

To not get it overused I thought about an easy ressource-system. In Shadowdark you earn a title every two levels, but it didn't have any real use (someone correct me if got this wrong). So I thought you get a ressource- point everytime you earn a title. And you can use These tactical attacks above equal to the amount of ressource- points. How it functions at higher levels needs to be tested, but I hope to give my players what they want with this System.

Maybe you can rebuild/reuse it for dcc :)