Yes, that’s exactly my use case, use the same TV remote (actually a universal programmable remote, ARRX18G) to control all my IR devices, and also control my lights.
Right now, for my home theater, it goes through:
ARRX18G → X10 IR543 → powerline carrier (same room) → X10 XPS3 light switches (no HAOS involved in this path)
And the response is instant.
It could also go through :
ARRX18G → X10 IR543 → powerline carrier (to a different room) → X10 CM11A → RS232 → HAOS → Z-Wave or Wifi switch
I haven’t tested this path, but suspect it will be a lot slower and less reliable.
In my home office, I also have one X10 light switch. No IR need for this one.
I tested this path
X10 RW724 (RF remote) → X10 RF/IR transceiver → PLC → X10 CM11A → RS232 → HAOS → Z-Wave or Wifi switch
It has a 2-3 second delay compared to
X10 RW724 (RF remote) → X10 RF/IR transceiver → PLC → X10 XPS3 switch
I’m looking to eliminate X10 completely to get rid of PLC reliability issues and delays.