Troopermaster, Walt’s Trooper Factory, AM (I believe?) all sell lens kits separately but I would double-check with them, or you can source dark green acrylic and cut it yourself.
From the CRL:
”Lenses are flat material, green in color, sufficiently dark enough to obscure the costumer's eyes.”
So, they will need to be green for ANH.
There are a lot more kits that are ANH-S out of the box, for Hero, ESB etcetera you usually have to put in extra work.
Chicken and egg though on if it's more popular leading to the kits being geared that way or vice-versa.
Cheapest option would be a doopydoos kit (with Tjay’s kit for even more accuracy) or having a friend 3d print you one.
I would advise you to skip the Hasbro conversion, if you ever decide to go for Centurion you would need to buy another blaster which is even more $ in the long run.