You have to be able to show some degree of having tried all regimes of insulins before a pump. That you can carb count and know about dose adjusting your insulin.
If you have done all of that and still struggling your endo should consider a pump.
Numerous DKA's show that there are problems, but not necessarily with the insulin but for patients that are either ill or are not perhaps understanding what they need to do.. DKA can still occur with pumps. My old pump consultant would not consider any patient that had ben DKA, as cannula failures with no back ground insulin can lead to problems quicker than injections.
Have you tried everything and been fully compliant with your team?