You build trust with stakeholders, usually by solving important problems until you reach a point at which having you solve a new problem is more important to them than what you solve it with. It helps if whatever tech you are introducing actually helps you in the task of solving more problems, increasing quality of solutions or reducing cost, in that particular order.

Good advice and similar to the strategy I use at work to use Common Lisp and Parenscript. They are yet to be completely accepted, but I'm working in it.