Nice pens and nice photos Roger. I love the minimalist aspects of the KOP.
I would, however, recommend having your other pens serviced by a pro because you some very nice pens and there's really no reason all of them couldn't be made to be a perfect writer and not leak. Since you already have them, I'd definitely spend the money to bring them all up to the KOP's level of pleasure. Then you'd have several perfect pens to choose from whenever the need arose.
Enjoy them all,
Well, I'm seriously considering repairing my Montblanc 146 and Edgar Allan Poe. If they don't leak...! I know they could be good writers.