Hm, we have a few very repetitive terraform projects to setup structured infrastructure clusters. For those, we just use ansible with a bunch of templating to generate a configurable, HCL-based terraform module and version that.

It's a bit of an "Caveman solve problem with rock" approach, but for very regular projects it's great. A new cluster is some group vars, larger changes to the structures can be easily reviewed - and if you really really have to, you can also just modify the generated code by hand to fix something your generation code can't deal with right now.