I like the idea of splints that slow you down, tea that gives a hhp buffer and getting back hhp by sleeping
In my opinion you should also be able to make linen bandages, using linen cloth, a egg and 0.2 liters of honey (egg whites and honey were used to sanitize bandages in olden times). Instead of actually restoring hit points a linen bandage would increase the rate at which hhp are restored via sleep.
On a final note, the hhp buffer granted by tea would be pretty taxing on the server, as it would have to create two different types of hhp and record which is which. Instead, willow tea should grant the "invulnerable" buff, which makes you immune to damage, however, every time you are hit the "invulnerable" buff's gauge would deplete by a amount based on how much damage you would have taken.
I'm pretty sure that would be much easier on the server.