After a lot of research and not finding much that was available in the UK, I finally have come across this external battery setup to power both GH5 and monitor. More in
ZIMO Decoder und Sound-Decoder für "kleine" Spuren (N bis 0)
The Story of Sentien: Part III
YOUCHOOS DCC SOUND Zimo mx645r 105 DMU 8 Pin with Immersive Drive with speaker £79.81 - PicClick UK
ZIMO MX645R 8 pin DCC Sound Decoder with Stay alive - like Loksound £90.00 - PicClick UK
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