Look at it like this. Let's say the base warlord is on par with the base paladin, and also gets the extra attck at 5th level. Let's look at what the warlord would look like by the paladin giving up it's class features to be replaced by warlord features, as similar in power as I can think of
Give up divine sense, and warlord gets advantage on intimidation/persuasion checks a number of times = CHA modifier
Lay on hands replaced by inspiring word. . Pool = 5x your level of healing
Fighting style stays the same (warlords should have this)
Divine smite replaced by precision attack (use one of your warlord abilities to increase the damage of an attack by 2d8 for level 1, +1d8 for higher levels)
Divine health replaced by battlefield instruction, which allows you to send your precision attack to an ally within 30ft, up to a number of times per short rest = to INT modifier
Then you've got whatever subclass feature you want.
Replace spellcasting with maneuvers. You can learn a number of maneuvers = your INT modifier + half your level, rounded down.
So a 5th level warlord with an 18 INT (assuming they do this instead of CHA) would have 6 maneuvers, which could be used 6 times per long rest (4 at lower power, 2 at enhanced power) assuming you never used your precision attack. If you use precision attack a lot, then you don't have any warlord maneuvers you can use.
No warlordy things at will. And only 6 maneuvers learned maximum (probably less). And choose between using precision attack or said maneuvers; not both. is this what warlord fans would be happy with? I highly doubt that. Not from what I've read over the past few years.
That's the give and take I'm talking about. If it's a support class, then treat it like every other support class. We have plenty of examples of how that could be done. Git rid of extra attack for the ability to have a pool of at will warlord abilities that scale with level, or broaden the number of total maneuvers they can learn and utilize per long rest, something. But you can't do both. Not without having major balance issues. All the other warrior classes (fighter, ranger, paladin, barbarian) don't have enough other things to trade out and still get the extra attacks