WTB : Trimble 5700 / 5800, or compatible radio

Hi,

I have a pair of trimble 5700's , only one of which has a built-in radio (450-470MHz) . I'm wondering if someone would have any of these kicking around gathering dust :

- a 5700 or 5800 with built-in radio already ?

- a spare radio module for a 5700 ? probably rare

- any of the compatible, standalone radios (trimmark or others, doesn't need to be yellow  ! )

- any pair of radios with suitable specs... would prefer something in the ISM bands. I've been experimenting with LoRa modems but what I have isn't really user-friendly at all (bare PCBs with wires hanging out)

Obviously not a pro; sure I can find a trimmark 3 on ebay for 600$ but that's more than I paid for both 5700's !

Thanks,

Chris