Experience counts. Thanks.I doubt that those motors could care less about ripple. I've seen similar general purpose type DC motors like those used on some pretty crude DC power supplies that ran for years in near continuous use without issues.
Given their low amp ratings I would just use a simple light dimmer unit ahead of a bridge rectifier and a large capacitor for the power supply. I've got several DC motors I run like that in variable speed applications that work just fine.
I used a light 600w triac dimmer ahead of bridge rectifier for testing, but the dimmer eventually died. The uF value of cap I was using at the time
was small.