One thing to think about is consistency with other sandy's in the garrison since we all used hairspray and fuller's earth/grout. Screen used suits weren't painted. You've already joined mepd.net correct?
Technically you'd want to match the color of your armor and simulate them as being metal screws just so that they don't look like plastic screws glued to your armor. This is actually just a SWAT requirement and not needed for 501st approval but still a cool detail.
Those might actually work since they don't have to be functional. Diameter of the head looks about right. May just want to paint them silver first then a coat of white.
First of all, so sorry for your loss. It may be easiest to post some photos of the collection and some of us may be able to assess for you or at least point you in the right direction.