I'm really sorry but I didn't find any way to do that. You can change the colour and thickness of any entities inside the block, but due the fact that it's a special one (ACPPASSET) when you try to print it, the colour from the ACPPASSET properties will be taken and associated to the whole object and print accordingly.
Right now you can you just the AutoCAD trick (exploding or printing by normal AutoCAD)
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