Okay, I think I miss understood you the first time haha. I thought you were talking about how regaining stamina through "rest" (20 STA per 10 hunger) costed hunger for some reason. Mb haha.
I want to lay out the situation more in detail before proceeding onto what I want to say. This simulated fight will be based on your proposed STA solution.
Each Lona uses the same weapon (The STICK) and each attack of the enemy will be the same damage and STA cost (-5 hp, -10 STA) and each attack will 100% cause an injury.
Lona A (The God of War Lona) is a skilled and dodges everything, she effectively damages the enemy and burns about 80% of her STA fighting. She needs to retreat because fighting any further will cause her to be exhausted. Lona A deals 80 STA worth of damage and can now recover the full amount of STA because she did not take any damage.
Lona B (Noob Lona) sucks at the game but knows the basics, she can land her attacks but fails to dodge the enemies 4 attacks and once she drops down to 80% of her STA because of the fight. She retreats because she doesn't want to get exhausted. Lona B was only able to do 40 STA worth of damage because she lost 40 STA from getting hit. Lona B also is injured in 4 different places so her stats are debuffed accordingly. Along with that, because she is injured she is unable to recover the full amount of STA.
Now... I think you can already tell that this STA recovery system might be unfair already. This would punish less skilled players more heavily than it is already now because of they not only would gain less STA back during a fight, but did even less damage to the enemy and is more likely to get hit more often do to debuffs.
This will make an already decently hard game into an even harder game. I am not saying this can't work though. It certainly still can work but it will be too punishing for those that like to block with their face. Like, I actually want this proposed STA recovery nerf into doom mode lol.
Because the Lona already gets punished for getting hit (Hp and STA loss and potential injury to debuff stats), I don't think a reduced STA regain would be the right call. Even with a buffed STA regain per hunger, this would be an unnecessary punishment to those that are already punished.
And now for the tricky part. When you meant STA regen, did you mean during the fight(Like you press a button and it quickly regens your STA) or whenever you break away and rest real quick to regain STA?
I am not sure if you already know this, but you can regen your STA using blue potions during mid fight. You need to equip it on EXT-1 or 2 and equip it into her Skill slot Like so. This way, whenever you use the skill slot the potion is equipped to (for example the blue potion [E]) the effect of that potion will immediately activate regardless of being mid combat or not (Blue potions recover a lot of STA and cures sickness).
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Also, when you are fighting an Orc, have you ever thought about using
our lord and savior traps? They are incredible weapons, especially with the trap upgrade perk.
Edit1: Here is a quick gif
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Keep in mind i am only using 10 levels of SUR and stones as the trap Material. Lona does have the Trait "Improved Traps" that stuns enemies whenever stepping on Lona's Trap.