There is a "overkill tactic": do all the improvements for yourself at your own expense (your personal productivity and heat from the stakeholders). In this case

There is a "overkill tactic": do all the improvements for yourself at your own expense (your personal productivity and heat from the stakeholders). In this case you're doing it all yourself plus you take on the overhead of building the interface to keep the workflow of others unaffected. You'll get fired or you'll gain the support of other developers who won't see you as a threat (because of your low productivity and because of the handy things you do).