For those that haven’t seen the YouTube reviews Radiomaster have just released a budget Multi-Protocol OpenTX radio, the TX12.
It is limited on the number of protocols it supports, it only uses the CC2500 chipset (FrSky D8 D16, Futaba FHSS, etc). Though currently priced on Banggood at under £54 it could be a good starter radio or be used as a backup to your daily driver.
Alternatively, and this would be my preferred option, wait for Unmannedtech to get them in stock, you may pay a couple of quid extra but you’ll get an exponentially better service.
Nidge.