I mean, you either get 3.5e people who may not know 5e, or 5e people who may not know the warblade. Gotta go somewhere. *shrug*

Warblade doesn't convert cleanly, but if you want a martial character that has a lot of options, I would recommend Battlemaster Fighter. Take Shield Master and Prodigy (Athletics) as feats so you can shield bash like a pro and shove people around. Add Tavern Brawler if you want to use the shield as an improvised weapon and also grapple people. You won't get all the mechanics, but it should do a good job capturing the way the character feels to play (especially once you add similar magic items).