Batboard

Hi. I am wondering if anybody might know of a noise cancelling microphone motorola might make for their mobile radios. I have 4 radios in machines with a high noise floor, and the operators dont want to wear headsets. There are currently 3 xpr2500's, and 1 cdm1250, these of course are running in analogue. I have already tried all software settings in the xpr's. The mics that are currently on the xpr's are standard issue, but I dont think the heavy duty model offers any extra noise cancellation. I have been on mol and I dont really see anything offered with noise cancellation in mind. Perhaps something aftermarket?

I have found 1 noise cancelling palm mic by Motorola, HMN4016A, but it is discontinued, and NLA. does anybody know if there is a replacement for it?