It’s all good man. Different people have different wants and needs. Your hands are a bit full with other stuff so setting up an ereader the way I have with mine is just too much om your already full plate.
Have a wonderful day and I hope you can find a good solution for yourself.
The process isn’t hard or time consuming, but I understand, this sorta stuff isn’t for everyone. I’m just a huge proponent of “this is my device it’ll do as I say”
I have a Kobo n437, I swaped the internal sd card with a 32gb one and installed InkBox/Quill OS.
You’ll need a bit of linux skills to use a bigger storage solution to its full potential. The project is currently on hiatus as they port the OS over to the pine64 e-reader.
Worth noting otherwise, currently pictures in epub formated books don’t load (at least on mine don’t know about other models) so youll want to convert them to pdf.
I remember when this was forat curculating I found him and his post on mastodon.