The first two links contains complete scripts - you just have to mogrify them to suit your use case.
Other places to get a hold on what to do an how to do it
- [root tip] [How To] Do a manual Manjaro installation
- [root tip] [How To] Manjaro-To-Go LXDE with persistance
There is no complete script for your specific purpose to consume …
Read the topics and the scripts - you can easily create something workable - even installing a complete desktop …