Choose Boring Technology
There's a longer term issue that appears to be missing here. 
At what point do you change? There must be a point otherwise we'd all be here writing COBOL/CICS with some whizzy Javascript interface library.Over time it becomes harder and harder and more and more expensive to maintain old technology. Because frankly maintaining old technology is pretty boring and career destroying so you need to be paid more and more to do it.The marginal benefit of the new shiny is indeed an overhead you should try and avoid, but also you have to dodge the trap of being stuck in a technology when everybody else has moved on.Anyway back to the Adabas support...