Instead of changing the helmet, lego could just paint the rest of the armor with the same color. The lighter tone of the helmet is already good for Boba's look from Mando
Costumes Made of Lego: Homemade Boba Fett Suit
Star Wars fan builds his son a home-made Boba Fett suit made out of Lego | Daily Mail Online
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DIY Lego Boba Fett Costume | The Force is Strong with Autism Awareness
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I built the LEGO Boba Fett helmet set and a chest extension over a couple afternoons last holiday weekend. I'm pretty happy with how it turned out. : r/StarWars
Boba Fett™ Helmet 75277 | Star Wars™ | Buy online at the Official LEGO® Shop US
Lego Boba Fett Costume | Step by Step Guide
Lego Boba Fett 75222 Pauldron, Brazos Impresos, Cabeza de Clon Star Wars Minifigura | eBay
Boba Fett - Pauldron, Helmet, Jet Pack, Printed Arms and Legs : Minifigure sw0610 | BrickLink
Boba Fett™ Helmet 75277 | Star Wars™ | Buy online at the Official LEGO® Shop US