I never said it would be easy!
We sort of come back on the old problem of what being possible not being viable. You could (once upon a time, anyway its got a bit saturated now) make a nice economic case for developing an injector upgrade say for a VAG PD or VP engine. The test set you'd take a drastic loss on but you could break even in your first batch of sales and profit on the next
That said it can be done im sure, question is what people will consider value enough to proceed with