Exactly the same thing happened with my old Samsung TV  (B series?)

As others have said, Chromecast is the way to go.

BlakJak:

 

Our Chromecast remote fully integrates with the TV - volume controls and power on/off are controlled there. TV remote is in the drawer now, basically unused until we need to make picture adjustments.

 

Same here - but I found the Amazon Fire TV sticks better (for me anyway) as they also allow installation of non NZ 'market' apps.

Also around half the price when regularly on special. $49 until the end of today at NL. $79 for the 4K version at JB Hi-Fi.

The AFTV remote turns on/off (in order), the Fire TV stick, the home theatre and the TV. It controls the volume and obviously navigation in all the apps.

So one button On and one button Off and just the one remote.

The TV remote and the Home theatre remote had the batteries removed and are put away in a drawer.

I also installed KODI on the AFTV stick, so can access a folder I share on one of my home PCs and stream content from that to the TV.

I don't consume anything not intended for the NZ Market so I don't see the need to circumvent that particular set of controls.

Where we have media in offline form, the usual solution is to 'cast' from a laptop.

Our old Xiaomi Stick was not reliable as a 'cast receiver' so we forked out for a genuine which is more reliable.