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i don't quite understand your problem but cant you bake your materials to textures? (i maya its called transfer texture or similar) ... though you probably would need to make sure you have correct uv's
https://knowledge.autodesk.com/support/maya/learn-explore/caas/CloudHelp/cloudhelp/2018/ENU/Maya-LightingShading/files/GUID-487EC09F-D5EB-4EAB-A0FA-0A2865414442-htm.html