Nope, sorry. The CMTS is the gatekeeper for the system / master to the slaves (except in LA County where this is politically unacceptable and so they are "primary" and "secondary" :-). It answers the discovery protocol, sets the frequencies, encoding, enrolling & polling the downstreams, etc.
IIRC, the systems TX and RX in completely different frequency ranges, so the CMs may not be capable of RX in their range of TX frequencies (& vice versa). So I don't think you could even hack the firmware to make this work.
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