Plugin or menu for Linking sites

Hi, I have a small multisite. It is for a primary school 4-11 year olds and it has one blog and then links to 8 sub-blogs.

Is there an easy way for all of the sub-blogs to have the links for all of the blogs? So for example if I click on Class 1’s blog, it will have a widget with links for Class 2, class 3 and so on. I used to use Diamond Multisite widget, you just ticked the blogs you wanted on each page but this hasn’t been updated in 3 years and doesn’t seem to work

https://en-gb.wordpress.org/plugins/diamond-multisite-widgets/

Any suggestions? Or shall I just make a menu on each page and do it that way?