Joe,
I thought about taking a replacement spoked wheel to a machinist who could do this work, but worried that it might not be centered and able to turn smoothly. Also, it seemed that that the spoked wheel would protrude too far from the machine, and the handcrank would be jammed against it and not functional. Grooving the aluminum wheel seemed the only option -- but obviously I was hesitant to do this.
The motor is the original 1 amp like yours, surprising power for its small size, and runs fine. I will be content with using this machine as an electric only. If the motor needs servicing some day, I'll find someone who can also replace the wire.
Your advice, information and help are appreciated! This forum is a joy for those of us who jump in over our heads with the vintage/antique sewing machine bug.
Thank you!