Okay thanks for the comments. The Tanix TX5 looks good, I'm not seeing any in the usual spots (Gearbest etc.), are they discontinued? I have found a couple on eBay though so should be able to get one.
It's possible that I won't even use the M8S Pro L myself now. I won't have too many issues with the remote (I have an A2 Lite remote coming) but since I have recently converted my Windows i3 machine to an LE only build it has been a joy to use. To change to the TV box requires that the windows box gets turned into a NAS box and networked to the M8S, and just introduces a whole lot more complexity into the system.
I don't know if the Tanix would be much slower than the Pro L, I think for vanilla LE the 905X is good to go, I only got the 912 so I could mess around with the Android TV firmwares.