Yes it's been done before. There are captive breed endli from Indonesia that have bad gene pool and maxes out at 13" and those endli have been cross breed with senes.
I have 2x endli x polli hybrid. I thought this was an endli with unique patterns but later to found out that this is a endli x polli hybrid as one of my friend just important 4 of them from Indonesia and they look very similar and they were labeled as endli x polli hybrid.
first one