This is one form of the double sided SPD, by Coda. I have another pair of these on a Cannondale and found this set recently on C/L, to go on another. I think I paid $25 shipped.
I’ve seen a more square form by Ritchey, and ones that look more like just the mechanism and less frame structure.
Building good muscle memory wont take long. As with lots of disciplines, I feel it’s better to address it in many short sessions over a few days or weeks, rather than fewer long ones crammed into a shorter period. You’ll stay more interested, and have less mishaps due to fatigue, likely building better form in the end.