Re: Easy peasy, then.
It's easy enough to just use UNLICENCED spectrum! There LOTS of reserved space for DIY signals above 60 GHz and between 2.2 GHz to 6 GHz. The AMD Ryzens are so fast and accurate, I can keep a 5G signal to a band that is as accurate a mere 20 KHz separation between "channels" !
I already have the Ryzens and and already working on the SDR software part. The Ryzen-9 PCI-101 board design WILL BE FREE AND OPEN SOURCE!