can you not use metal mesh corner beads, just splay them out to suit? or go free hand and form them, take your pick. I prefer free hand tbh, looks better
For skimming I usually set a thin-coat stop bead (bendy bead) along the edge, you can then set the depth nicely on the other angle.
For the floating I would create the angle without a bead, much easier, then the use the above.
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