I need 8 more Kizarus to hit 50, I've got plenty of time. So I took a short break to think about Slasher orb manipulators that go well with INTHawk. The obvious one-man solution is
Kizaru, who gives you full matching orbs.
A less obvious but still guaranteed solution is
DEX Law + Doc Q + Doflamingo; you'd probably be running Doffy anyways so it's not really a three unit combo so much as it is a two unit combo. Law gets you TND, RCV, and DEX orbs, Doffy lets you put DEX orbs on Law, Doffy, and units that self-orb(ex. 3D2Y Zoro), and Doc Q turns TND/RCV orbs into matching orbs. If you don't get what you want, you can always reroll.
Blenheim does something similar in that he turns TND/RCV into matching orbs, although it stacks your team even more DEX heavy with at least three DEX units.
The F2P answer to this combo is
Story Croc + Coliseum Vista + Doffy, in that you reroll orbs with Croc until you're happy with what you've got, use Doffy to get orbs where they're needed, and use Colo Vista to get rid of your mistmatched orbs and put matching orbs in their place. It'll take more rerolls to get what you want, but you can eventually get full matching orbs if they're needed, or get the orbs that you need to clear between an orb shuffler and Vista.
The downsides to not using Kizaru are obvious, it takes more than one unit to match your orbs and you've got to drop other units like conditional attack boosters or G5 Tashigi. Also (obviously) being a Legend, getting him is always in question, assuming he isn't your friend captain. But if he isn't your friend captain, the big positive is that you can run other great Slasher friend captains like
Timeskip Zoro or
Legend Law to get bigger bursts that can compensate for your lost unit.
Then of course, there's
Kinemon who not only gives you 2 or 3 matching orbs, he'll also reduce the cooldowns of your Slasher units letting you kill things that much faster. F2P INTHawk owners are going to have a field day when Kinemon and Legend Zoro drop:
All you need is one STR orb from Croc's orb shuffle to guarantee full matching orbs. This team gets even better once
Coliseum Suleiman drops and can replace Story Croc, as Suleiman is a self-activating F2P conditional attack booster, similar to Monet. That'll get you matching orbs on everybody but Kinemon unless you farm his orb in anticipation, plus even more damage.