[Manuka Jock]

I have done it . No problem.
I glued a sacrificial 1" frame around the board and trimmed it off afterwards

 

[Manuka Jock]

Knots are endgrain .
We pass them thru planers/thicknessers .
The sane amongst us take light passes , on machinery appropriate in size and capability for the job .
The same applies to endgrain blocks.

 

[Manuka Jock]

Even if knots are end grain, it's a very small piece which is completely supported on all sides by solid wood. When was the last time you ran a single big knot, with no other wood, threw the planer?
I wouldn't think you have. Neither have I.

Read my first post .
And keep it real .