that is sequential! I understand that you don't want to make the whole thing sequential but then you could also do that from the outside: have a pre-script for starting Node-RED and if Node-RED stops, have a post-script to handle that. Plenty of daemon creating software (e.g. systemd) allow for adding scripts to the pre-start and post-stop parts of startup sequence.
Just as an alternative ...
The goal here is to do it in NR, giving access to NR tools but that's the idea 
It's a sequence that isn't really one (nodes continue with events)
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