In reply to Fredt:
There is ... but not in North Wales.
You may need to think outside the box and cast your eyes further south to less well-travelled and more secret places where there are sea cliff Severes a-plenty (well, 17 in total), on very good hard sandstone, which gives excellent climbing:
http://www.ukclimbing.com/logbook/crag.php?id=19082
'Feral Pedestrian' would probably be exposed enough, with an exciting little abseil in as well.
Failing that, there are better climbs at the grade on the adjacent tidal island:
http://www.ukclimbing.com/logbook/crag.php?id=19217
'Crab' is deservedly popular, although not that exposed but it can be approached without abseiling. 'Heavy the Beat of Weary Waves' is good and nicely exposed, while 'The Day the Balloon Went Up' is superb at the grade - and quite exposed too. Both the latter have abseil approaches.
The spectacular location, no queues and frequent sightings of pods of bottlenose dolphins feeding 50m offshore are simply the icing on the cake.