I had putted forward an idea about “Țintaşi”, the Vlach marksmen, as their UU before.
Low HP glass cannon, able to be a charged shot much like the coustillier. On the other hand, for reflecting the ambush, the attack from Țintaşi may not show their location automatically if they are out of your LoS.
There are only 5 foot archer UUs in the game, I hope there could be more.
Anyway, I just share my opinion. Put aside the balance problems from the bonus and tech tree you designing, it seems you have studied the Romanian history hard, well done.