Any of the wellgo SPD have been hard to find. It's like they stopped making them. Maybe due to patent or limited run issues. So far this is the list I comprised.
https://www.aliexpress.com/item/Wellgo-M19-Clipless-Pedals-MTB-Mountain-Bike-Pedal-Quick-Release-Cycling-Aluminum-Sealed-Bearing-Bicycle-Pedals/32643668796.html
http://www.benscycle.com/p-26788-mks-us-s-ezy-clipless-pedal.aspx

Yup...small list, but the QRD II-C231B does look promising, as does the QRD-R096B on ebay. I would go with the road bike type, but the SPD-like petals seems less conspicuous for touring/cycling shoes, not to mention familiarity. Seems to me the SPD compatibility of the MKS is specific to certain models and will have take the word on those currently listed. So, it seems I am leaning toward the MKS and in search of flat petals that will be the deciding factor. And hopefully the post of all MKS being interchangable is correct. Will have to contact the Ben's cycle store or distributor for confirmation. Replacement pare a concern. I hope I won't have to make my own parts. MKS appears more easier to get replacement parts from than wellgo. However, wellgo at first glance allows interchanging flat petals for the clipless with the fixture that goes on the crankset.