Before you buy an Apple TV you can try installing ProjectIvy launcher and see if that suits your needs. It's basically a simplified launcher UI for Android TV devices.

It's not perfect, not if it suits your needs you won't have to buy another device.

That's the one I tried on the Fire Stick, it doesn't always launch, sometimes launches a few minutes after start, and when pressing home it would go back to the default launcher.

I think it's related to the accessibility settings it wants enabled, I was never able to turn it on like it says because the setting just refuses to enable.

I like FLauncher! Stupid simple and does the job.