Couldn’t you line trace through the keyhole and get a valid spawn point from the “other side”? If it is a keyhole, and the line trace was to be aimed through it, it would not collide with the object containing the keyhole.
Of course, that requires some precision aiming for your teleportation. May or may not work well for the game you are trying to make. I am in favor of the spawn dummy actor first and have it adjusted to the location, THEN you are put in its place. It’s a little too… messy… without the proxy.