Just gonna shamelessly plug the Crayon Shin Chan book club here We read volume 1 together, so there’s a discussion thread and a vocab list. I also added vocab for volume 2 to the spreadsheet when I read it by myself.
I agree with your estimation of the difficulty. There are a bunch of contractions, but you have to get used to them at some point if you want to read manga, so you might as well learn them with Shin Chan The vocabulary is often pretty simple because it’s slice-of-life.