Another option would be cutting mitered ends and putting in a hidden spline, similar to cutting and gluing in a biscuit.. Or use dowels. Or double biscuits if you have the space. All of which will make a no-endgrain joint. Or, lightly glue up the miter corners, then cut a spline across the corners and use a matching or contrasting spline on the outside. Kind of depends on what part of the corner you want to be endgrain (or spline) free, the inside corner or the outside.
The more I do, the less I accomplish.