I used a plug exactly like the OP posted, wired in 6-50 configuration, purchased at Lowes, for my bandsaw. No issues. It isn't pulling what the current a welder would, but I personally wouldn't have any concern with it.
I have a lone 220v plug in the garage. It is normally in use for the welding equipment, hence 50A. Bandsaw pulls nowhere near that.
The plug in post #1 is what I have used on several welders. Cheap and works. 6-50 is a 6-50.
CT

Yeah not sure why the OP didnt like how its adaptable to 6-30p.![]()
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I’ve used them before and I don’t care for them. They have a cheap feel to them and the prongs are always moving around.