Yamaha Receiver IR remote via. Homey Bridge

IR signals can be transferred into a cupboard using an IR extender.
If your remote and the bridge are in visual range of the IR extenders’ receiving unit, the IR signals of both units, then go by wire to the transmitter, which you put in front of the Yamaha in the cupboard

You can’t use a IR [amplifier/tv] remote to command Homey bridge afaik, if that was also a question.