The Cyrus III service manual is available from HiFi Engine (free to register). The manual details how to convert to the PSX-R and so it would be a case of reverse engineering that to undo the conversion. It sounds straightforward but the manual pictures are poor... it probably makes more sense when you see it for real.
https://www.hifiengine.com/manual_library/cyrus/3.shtml#3
https://www.hifiengine.com/manual_library/cyrus/3.shtml#3
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