I'm looking to see if there is a common / correct way of unwrapping a beveled cube for a seamless texture, specifically a wood texture.
I can of course mark seams where the flat faces used to be (now the flat + chamfers) and rearrange / rotate these groups manually, but this is tedious and there will always be more than one place where the seam is visible (below).
Is there a common way of unwrapping a beveled cube (or other object) that results in minimal seams?
For objects like this you will always have visible seams when using a stock texture with UV projection.
If all you want is a simple seamless look and you don't care about full realism, box mapping may do the trick - it uses triplanar projection, which is a common shortcut for getting seamless looks for simple textures without using any UV map.
For a realistic look you would either need several different image textures and a painted mask, or a procedural material as Robin mentioned in their comment - not just because of the seams, but also because grain on cut wood will flow differently on different sides of the cube as seen here:
