Since there was no further response by the creator i coded my own basic export/transform script for Tilekit to Godot scene in PHP. You need php 7.4+ cli installed to use it. The script can be found at
https://github.com/voodooEntity/tilekit2godot
If you need specific changes please just fork it and adjust it there. I'll not provide big updates or specific feature wishes. Only posting this to help others in the same situation as me to maybe have a starting point or inspiration.