Thanks for your reply @timnolte , however my zigbee devices continue to work fine with the ZHA integration as usual.
It was an oversight on my part not to specify I was referring to some 433MHZ GS-WDS07 door and window sensors (these are ones that transmit both an open XXXXA message, as well as a XXXXE close message.
These were then sent to a Sonoff RF bridge flashed with tasmota >> MQTT >> HA
After digging around I found this post, opting for strategy 2 via @123 's Node-Red flow, however I was still unable to have any success. After implementing the node-red flow and adjusting the relevant topics in both the demultiplexer node and within the configuration.yaml, I’m now not able to receive any state change whatsoever.
I may have a look at the input_boolean alternative, although I can see that getting pretty messy with my already preconfigured automations within both HA and Node-Red.
I will update this post if my endeavours prove successful 