The easiest and cheapest way is to cut a very small piece of aluminium foil from your kitchen roll, and loosely put it onto the screw, then use a similar size normal flat blade screwdriver to unscrew the ruined one out.
Some years ago, I managed to remove the Logic Board from the case without the removal tool. I find it difficult to do the same now. But I can't wait days for delivery of the tools. Alternate method should be demonstrated.