So I have been playing with a new P25 receiver Phase 1 and 2, DMR and NXDN are available but still being worked out. This works great with simulcast systems.
https://bluetailtechnologies.com/
It was designed and supported locally here in Washington. It is designed to operate standalone as well as with software.
I have been working with the designer tweaking firmware to fix minor issues, he has been extremely responsive.
This is the most cost effective solution to the simulcast issue I have found. It can operate standalone for going mobile. The software is open source.
Here is audio from the Tacoma simulcast site of the WSP 700 system.
Attachment:
I'm not affiliated with the maker, just a hobbiest. This has a lot of potential.
Currently listen to SS911 Orting simulcast from South King County with excellent audio.