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Thanks for the reply! :)

But I really have no idea how to assign the key to the shortcut. I tried yesterday going into items and clicking around but nothing happens.. 

I know this detail is added just for the ”true to retro-aspect” but I would be so happy if the keys just worked automatically.

agree

You need to go to quick items, same way you equip blood vials, select the key ring, select the clinic key, then go to the door and interact with it while the clinic key is in your quick item slot.  I think it's a reference to the way that keys work in King's Field.

Thank you so much for great explanation! I will try this later! :)