1. I'm right, you're wrong: there's no virtual, on-screen keyboard on the Vega, it's a plug-n-play slab of a controller. Just buttons.
Er, you should take another look at your link. A text search on the page for "virtual" will bring you to this sentence:
Plus the device also has a virtual keyboard as well to allow adventures, for example, to be able to be played, so we have listened while keeping to our original concept of wanting the ZX Vega to be accessible to everyone.
Also, from Retro Computers' own Vega page:
Comes complete with ready-mapped buttons for all included games, as well as the option of using the in-built virtual keyboard.
You're probably thinking of the Recreated ZX Spectrum, the bluetooth keyboard that needs you to bring your own computer (PC/Mac or Android/iOS).
I honestly don't know anything about that product, as my interest in this kind of thing is limited to cataloguing data for the plug-n-play market. :) The asking price for something like the Vega is also a deterrent; while I've bought certain plug-n-play systems only for information-gathering purposes and then returned them to the store, I wouldn't risk doing that with a $150 product.