I suspect one of the problems here is that cable mount sockets as you might want to plug into this don't have standardised external dimensions so it is difficult to design a panel mount plug that will fit reliably unless it protrudes a long way and has a lot of clearance around it. Also schuko is generally not used where weatherproofness is required.
What you're asking for really is very unusual, is there some specific pre-existing cable that you need to mate with? In the shucko-using parts of the world (well, Germany at the very least) this type of connector would be the norm for a weatherproof power inlet:

The males don't usually have weatherproof covers, they're waterproof (IP44) when mated and usually just mounted facing downwards to keep the worst of the rain out when not. I think I have seen covered ones and rubber boots though a quick search didn't reveal much. In any case you'll probably have a lot more luck with that connector family. If you really must mate with a cable-mounted female schuko you may need either a hanging tail or a short adaptor cable.