The repurposed tech doesn’t have to be clean or even look like titan tech. You could have a warframe that looks like Mekkatorques mech and still be a warframe that utilizes titan tech. It could be something as simple as a weapon system that harms Old Gods, to a device that prevents a warframe pilot from being corrupted by whispers.
Tinkers are a very popular concept though. That MMOC poll posted earlier is proof enough of that.I have a feeling they regret a lot of things. Massive sub loss being one of them. If they want to regain those subs, they need a concept that hits it out of the ballpark. IMO, Titan-Tinkers isn't one of those concepts.