No pics sorry. Havn't tiled it yet. Was tanking today. So far the best solution I've come up with is to slot the back of the trim into the gap between the tile boards so it doesn't get pushed oout of angle . Hard to explain without a pic
Difficult for me to make out what your trying to achieve tbh.
But you could mitre the back of the tile your holding it against and that will swing the front face round. If that's what you're trying to do.