I think your statement is a good one for your customers. You don't make finished devices, but FDA is clear that contract/component manufacturers are still an extension of the finished device maker's manufacturing process, so you need to operate your processes in accordance with meeting you customer's responsibilities to ensure process controls, quality checks, and validation meet requirements.
Also, you should be aware that although ISO 13485 was previously a document linked directly to ISO 9001, 13485 is now it's own stand-alone requirement. There is a possibility that 9001 and 13485 requirements may move farther apart as they evolve.