yd100 wrist pin sizes different?

Hey weird unrelated question but do you guys have any suggestions on a way to convert a beach cruiser to disc brakes? I know there’s adapters online or whatever but I’m not too sure how reliable they are. Especially with the wheels I have. I have the 10 spoke wheels the bbr tuning sells. Thanks.
The best way is to get forks with a disk brake mount and make your own rear mounr