An auditor is going to demand specific training for this, and you're going to have to prove that they are being retrained annually (like all other technical training requirements) I doubt (even though you may be correct) that the auditor will have ever seen this situation, and will not care for this. Double check you're regulatory requirements, like Glenn said, you're opening yourself wide open to liability-real or implied
You may likely be open to 2 minors.....184.108.40.206 Equipment shall be calibrated against national or international reference standards and methods or to an accuracy appropriate to its use. In cases where standards are not available, the site shall provide evidence to support the calibration reference method applied. 220.127.116.11 Calibration shall be performed according to regulatory requirements and/or to the equipment manufacturers’ recommended schedule.
The FDA also has regulatory requirements-----so no, the resume of your staff, however glowing, is not going to be sufficient