Modifying Philips Motion Laser Projector

With all the after Christmas sales I picked up a Philips Motion Laser projector for "cheap" ($20) but I have always been bothered by the red and green colors that are typically used in these shows. My plan is to replace at least the green laser diode with a blue (probably 450nm or 445nm depending on what I can find for cheap). I took apart the unit as you can see in the attachments and so long as I can figure out the supplied power everything should be pretty easy...I think. A couple of questions:

- There seems to be a filter on the green laser (I broke it a bit when removing). Any idea what that might be?

- Any concerns with the diffraction grading wheel for using a different wavelength?

- Any recommendation on where I can get a blue diode? Looking for 1-5mW based on safety (and the warning note on the package stating that the system outputs no more than 5mW). Right now I am thinking I will need to buy a pointer and pull the unit.

- Any obvious things I am missing?

I apologize in advance if this is the wrong category to post this.

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