Speed reducer options for Juki 1541 / Could I 3D-print a larger wheel?

I'm not sure if this is the best place to post this so if anyone can recommend a better place, thanks.

I am looking into speed reducer options for my Juki 1541. It seems there are two options. Mount a much larger gear onto the machine or what is frequently referred to as the "box style setup". The "box setup" basically relocates the servo motor under a box that houses an intermediate double gear that raises the gear ratio to the machine's wheel.

Box Setup

Q1: For the box style setup, are there any standard or go-to options that are popular? Or are these mostly mostly put together by DIY-ists and sold through various boutique sewing shops?

Larger Wheel on The Machine

I watched this video of someone that went with a larger drive wheel on the machine. He said something at 00:58 along the lines of a plastic wheel is better than metal because it has less mass and so it puts less stress on the machine. This sounds like something he made up considering the OEM wheel is metal.

Q2: Has anyone heard or is there any truth to plastic wheels being better on the machine? I'm sure the reduced mass helps a little - but to any significant degree that outweighs plastic's disadvantages?

3D Printed Wheel

Either way, if there are people out there using plastic drive wheels on their machines, is there any disadvantage to 3d printing my own wheel to reduce the speed? I could design the wheel around a 17mm steel bore (which shouldn't be too hard to find) and print it in NylonX.

Q3: Any reasons why the previous paragraph is describing what would be a fool's errand? Should I stop being cheap and just buy the wheel?

Thanks!