While it is currently possible to send CEC commands through cec-client and the OR shell execution protocol, this suffers from the cec-client utility being very slow in responding since it’s used in single-command mode.
I understand it would likely not be realistic to implement in OR 2.6 since (afaik) all current development efforts are focused on OR 3.0, but would it be possible to include direct libcec integration as a new protocol in OR 3.0?
In the meantime I’ll give https://robbiet480.github.io/cec-web/ a try, it should offer CEC control over HTTP-REST