Do what you feel is right, I like patina on my bikes and my cars as mentioned they are only original once.
Paint it, change the color etc.... when you decide to sell it someone that likes what you have done will buy it....in the end you can't take it with you...so enjoy it while you can.
JM2C's
P.S. I have yet to see a non factory paint job hold up as well as the factory applied finish....unless its on a Pinarello...I have one so I fell I can mention the brand.