Cork has great connectivity IMO. Double daily to Paris would be economically possible with AMS at double daily and Heathrow at quadruple daily. If it was to happen, it would really undermine AMS to the point where it may be cut to 1x or 0x daily, back to where ye started.
Dublin has a far bigger market, and you can't go expecting to get any more than a fifth (that's pushing it) of what Dublin gets. Its the harsh truth. You need to get your passengers to say in and drive down to Cork before you go introducing service that the vast majority of people won't know about.
Something like 5x weekly to Madrid may work and help be in line with the Latin American departures there. That's about as much connectivity that Cork can stretch ATM IMHO.