Thank you, by one of the scripts you mean I can either install YazDHCP or as you described here I can eitherUse one of the new dnsmasq.conf.add scripts for the index of your IoT lan and add your reservations there.
add static DHCP entries using either the /jffs/configs/dnsmasq.conf.add config file or the /jffs/scripts/dnsmasq.postconf script.
For the simple approach, without scripts I can presumably just add (x=index) numbered dnsmasq-x.conf.add config files populated with the details shown in @bennor example above for VLANs?
[EDIT] Seems to have been confirmed by @bennor below.
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