Dear @Max-Weinland
Im back! Apologies for the delay,
I do not think a child theme is completely right however -
Yes you can make a child theme and make adjustments to the Styling etc as you desire, the difficulty is that we cannot provide deeper support for one's personal customisation of Lay Theme,
Making Child Theme's can require more maintenance as eventually larger changes made to the parent theme can cause unexpected bugs and issues, providing support for this would be an endless task, as each person's child theme would be different.
You can try methods and solutions as you wish but i am unable to hunt them myself at this time, also if you are already in contact with a developer,
Lay Theme provides the options we have available & i'm sorry that i cannot help further or change its structure, I am happy however to to take your requests and add them to our development notes for future reference & discussion.
Sincerely,
I wish you good luck in finding a solution that works for you,
Best
Richard