You could splice sections of mono into your leadcore and then have something to attach to your releases. Personally I think the more knots you add the more potential for failures you have so I prefer to run dedicated setups, but many people run segmented leadcore. I have acquired enough rod/reels over the years to have dedicated setups. I have 2,3,5,7,10 color leadcore setups, seems to cover just about everything I need.