Was getting bored waiting on the Razer Turret bluetooth keyboard and mouse lapboard, so I googled bluetooth keyboard converter.
Couple of hits.
Perfect one appears to be the Nulaxy, only been out for a couple of weeks - looked to me like it had failed in it's crowd fundraising - https://www.indiegogo.com/projects/k...etooth-adapter - but then found it for sale on US Amazon - stupidly cheap, but no shipping to UK.
Couldn't find any other seller, so have ordered from ebay - with shipping, same price as on US Amazon, before going on sale, so not too bad.

Basically, if it works, then I'll plug a decent keyboard and mouse into the Bluetooth KM switch and will be able to use it with PC/laptop/phone.