Nothing would make me happier, but Disney is devoted to stamp every inch of Star Wars with their own nouns.
I see this all over social media right now, and I don't understand it at all! It's like people who pay insane amounts to clone their beloved pets... why would it be in any way satisfying? Kyle Katarn is interesting because of his stories and who he was in the Legends contintuity... bringing him to a completely new story just for the sake of recognizing his name seems like shallow lip service.
It's the same way throughout. People are going nuts about Thrawn coming to Rebels next season and I'm just... why would I care? He's a random blue guy in a background costume from A New Hope when you don't have the establishing context of Heir to the Empire. It's like otherwise sane people are begging for Seth MacFarlane-style writing: 'this is great because he said a thing that I recognize what it is!'
Let Legends be Legends. Take from it freely and happily when there's something that'll drive a story or improve the world... but don't rely on it as some crutch, or some shorthand way to get street cred from longtime fans... let the new thing be its own world.
(That all said, I would LOVE a Tales from... style story that revisits all these deleted heroes in whatever form they have in the new continuity. That says IF Kyle Katarn isn't the guy stealing the Death Star plans, who is he and how is he different? And just do that for all the Luke standins and the various beloved Mary Sues from the 1990s. But I think it needs to be a focused project rather than having old EU material as spices to entrance crotchety fans with unrelated stories.)