I don't know about left-handed fountains, but the pens I've seen are biros, with a moulded part that you hold, with the finger moulds especially for left-handers. I bought one for one of the pupils I support, and he loves it.
The left-handed ruler starts from the opposite end, not sure if that really helps.
I have a bottle of witchhazel in my cupboard, and a bottle of stardrops!! But I'm not that old really - well I don't feel old.
Rosemary