@BMPU-9566, From your description, I know you want let Intune Manged multi- app kiosk devices to access CD-ROM. If there's any misunderstanding, please let us know.
Based on my research, I find there's no setting related it in Kiosk device configuration profile or Device Restriction policy.
Also, I have done some tests in my lab. I try to pin the CD-ROM to start layout, export it as xml and deploy it in the kiosk profile. But I find it will not be deployed to the kiosk devices. So I think CD-ROM is not available for kiosk devices.. If we want this, I suggest to feedback it on uservoice of Intune:
https://microsoftintune.uservoice.com/forums/291681-ideas
Hope it can help.
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