No no, I don’t think the ability tasks I’m talking about would help you with this. They’re mostly for waiting for a confirm/cancel input, or waiting for the ability input to be released/ pressed again. What you could do is assign a unique ability to all inputs you want to use with a unique tag each and then just listen in an ability if the other ability is being pressed, perhaps cancelling that newly called ability in the process.
I do not know about the specifics of your fighting game-esque abilities. so it is hard to really suggest a proper solution of what you wanna do, but perhaps using gameplay effects that grant you new abilities the further you get into your combo could be a different approach? I am fairly sure that whatever you’re trying to do has a proper good solution, if perhaps a little roundabout.