This is something I've actually considered myself. From past experience I'd NEVER run OEM dampers with aftermarket springs again, but I would consider running OEM springs with aftermarket dampers, after all many people do this purely as a cheaper form of maintenance when they have a weepy shock after 250,000 miles or something. FWIW the U.K. Spoon distributor does say you can use these shocks with OEM springs but then goes onto recommend the Spoon springs, surprise surprise. I don't think they'd say it was possible if it wasn't though. Description from the UK site below:
"The Spoon fixed type suspension is designed for improved handling and sports driving but without the complication of damper and height adjustment.
Designed for use with high grip radial tires and occasional circuit use
Can be used with the standard springs
Designed for sport driving
No height or damper adjustment capability
Constructed by SHOWA (original Honda manufacturer) for impeccable quality and longevity
For best results we recommend use with the Spoon Sports Progressive Spring kit
Ideal for the everyday use driver that may track occasionally or enjoys a sportier feel. "
2014 ZF2 UK - Rigid Collar - Spoon - Kansai - Mulsanne - Pivot - Dixcel