Here are some options I would consider.
1. Convert operator to linear using the Wittur AMD, SGV, or LD-16 full operator designed to upgrade old Miami Elevator HD equipment. In this cause, you will only need to replace hardware on the cab door side.
2. If you are replacing the Miami Elevator controller and wish to keep the Miami HD operator, You could just order the new MOVFR3 control box and motor, not the while operator. This is a setup similar to MCE Smartraq. You can buy the GAL or the MCE equipment. Install on existing Miami Elevator HD operator (motor and logic). Keep in mind though, TK has rendered the HD operators obsolete. It may be difficult to source mechanical components, especially for older Miami Elevator versions. The advantage is that both products don't have physical limit switches; however, if you prefer to physical limits, the thing to do is order the MOVFE linear components (not the whole operator). Then mount limit switches/detectors to door panels, along with motor and logic box, and off you go.
3. Replace existing harmonic operator (just operator, not skate, hangers, etc) with either the Wittur drive only kit or the GAL MONXT-OMNI kit. Both are linear and are designed for retrofit use. Remove old Miami Elevator operator. You can also do this with an Otis Glide A or P.
Also I've never seen a dmc talk to another type of operator. Can you post a like to that ld-16 where it says it will talk to a dmc? I haven't been able to locate any documents for that operator or any other that specifically says it electrically works with a dmc.
Thanks
https:/
They have a DMC1 interface to connect any discrete Door Op.