Automation Blocks Stitching footage with 2 starting at the beginning of the timeline

You probably want to use a script similar to the one I show here:

https://docs.mamoworld.com/automation-blocks/tutorials-pr/batchSequenceCreation

Instead of looping over multiple variants for first and second clip,you can also just use one variant for the end sequence (in that case you can skip one loop completely).
You can also use sequence items instead of footage items as your clips. This will insert the sequences as nested sequences.