WANTED: A way to obtain small amounts of RP

I currently have, I think, 468 RP. This is leftover from an RP gift given by one of my friends. I have previously received a small (18 I think?) RP gift from Riot to purchase something a number of months ago, so I am not eligible to receive another RP bump.

My question is this: Does Riot have any plans to provide a way for people in my situation to obtain the small amounts of RP needed to 0-out our RP? I would like to purchase a 487 RP skin when it is on sale, but there is no way for me to obtain that little RP. I realize that the credit card processing fees probably would not even be worth it for 19 RP, how ever many cents that would cost. Maybe you could work out an algorithm then, that worked like this:

• If a player has RP for at least [% to be determined by Riot, like 75-90%?] of a purchase, and
• If the remaining RP required for a purchase is less than the minimum amount of RP Riot sells, then
• Riot will allow the player to convert IP to RP at a rate of 10:1 to cover the difference in price.

I hate seeing the 468 RP on my account -- it drives me a little bonkers. I want the ability to spend everything I purchase on skins, and right now I cannot.

Thank you.