One-Way Control Signal Transmission via CRSF Between Two Flight Controllers

General
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Goal:
Implement a one-way transmission of control signals (RC channel emulation) from one flight controller (FC1) to another (FC2) using the CRSF protocol.

Requirements:

  • FC1 acts as a transmitter, generating control signals for FC2.
  • FC2 receives these signals and uses them to control the motors.
  • No telemetry (feedback) is required from FC2 to FC1.
  • The implementation must not use a standard ELRS TX module (i.e., FC1 itself should send CRSF commands via UART).
  • Preferably implemented using a Lua script on FC1, if possible.

Would this be feasible within the ArduPilot environment? Are there any known limitations or alternative approaches?