A friend of mine (former coworker) left my company to go to a fabricator that uses a combination of Inventor and Tekla to do their design work. In the past, he and I had struggled with getting an acceptable format for CNC tube cutters out of Inventor (what they really wanted was DSTV, which obviously we couldn't do). For us at my company, it was something we've needed to do a handful of times in the company's history. For him in his new position, it would be a constant need.
I know nothing about the software myself, so I am not necessarily recommending or endorsing this. But he is currently testing software called "CMS", which apparently includes an add-in DSTV exporter for Inventor. He's not very far into testing it, and I haven't talked to him for a few days so I'm not sure how it's going for him. But if this is something you have a need for often, it might be worth checking into. I'm mostly just aware of it because he asked me to provide him with models for some of the parts we had struggled with in the past, so he could use them as part of his validation of the software.
See link below.
https://strucsoftsolutions.com/cms/
Edited: I had initially missed that a couple of people had already mentioned what appears to be the same software. My friend always refers to it as "CMS" - I didn't realize until I looked at the URL that it was the same software you guys were already talking about.