One idea that's worked well for my clients has been to create a Skunk Works, which is effectively an autonomous, outside-the-bureaucracy, kinda-sorta-secret R&D team.

I've been on these teams before, and if they're truly left alone with a pile of ideas and resources, they can accomplish incredible things. (This is how Lockheed Martin developed some of its most incredible tech, and how Google takes its "moon shots".)

But it will be a challenge to management, because they'll have to stay out of it after the initial specs are delivered. If you can get buy-in, though, you'll bring back startup-level development speeds to your organization.

I'd be happy to discuss some of the processes I've followed and the structure of the teams I've been part of — just drop me a line.

Good luck!