@Jf Thanks for reaching out!
Wide bike shoes, particularly in EEE width, are pretty hard to come by. We carry one road cycling shoe for men (no models for women) in a wide, the Sidi Genius SR7 Shadow Mega Bike Shoe, but, unfortunately, we are down to only one size left in stock of that shoe. If you have the ability to go into your local REI store, we could see if they were able to be ordered from Sidi. This would require a process called a special order, which allows us to order items from our vendors that are not carried by REI. A special order is dependent on the vendor for processing and shipment so times may vary or there may be shipping costs.
Bontrager also makes a road shoe that comes in wide, the Bontrager Velocis Road Shoe, that may also be available for special order through REI. However, we cannot find anywhere on Bontrager's site that indicates how wide that shoe is.
One other option would be to swap out the pedals on your Peleton bike and see if you can find a pair of bike shoes that are wide enough that are SPD compatible. It does not appear that REI carries any brands that make a shoe that wide (outside of the one Sidi model). Shimano only goes up to E, as an example.
Hopefully this helps!