I don't really think it's possible to create a human mineable coin. The problem is you need a PoW algorithm which is hard for bots to solve but easy for humans to solve, but it also needs to be easy for computers to verify the solution. There is no easy way to meet those requirements. The problem space would have to be so huge that a bot wont have any chance at finding a solution by randomly searching for one, but it should be solvable by applying creativity and logic. For example when a programmer is faced with a problem he must apply creativity and logic to write an algorithm which can solve the problem. If he were to randomly try every possible algorithm he would never find a solution, but by applying human reasoning skills he is able to write an algorithm capable of solving the problem. That is the sort of PoW problem required to make a human mineable coin.
what about a captcha type thing? thats easy for humans to solve