We're currently on Moodle 3.8.2+.
LTI is set up and has been working great for a few years now.
A couple people (including me) are considering using WeBWorK with LTI for homework, but we'd like quizzes graded separately. I could set up a second course that uses LTI with homework grade mode for grade passback. Or I could try setting up opaque.
If it works for us (a big if - we have heavily customized Moodle distributed across multiple VMs with a load balancer) I can work with interested faculty to create set definition files over the summer and then export them to Moodle as detailed in your blog.
First step is to make sure we can pull problems from locally developed libraries as well as OPL.