I'm confused - are you in need of a kidney now? Or just assuming you will be in the future because you only have 1?
O - is the universal donor, and more rare due to the RH -, but there's no reason to think you won't be able to get a donation if needed. I am A - and donated to my O + husband, so in some cases, A can also donate to O. Do you have family that might donate to you if needed in the future? My husband was also worried that because he's O, he would have a hard time getting a transplant, but as it turned out, I have the rare A2 blood type and could donate to him - we could never have known or planned for that. I had no idea that there were even sub-types of A or that they can donate to O.
Anyway, the point of all that is to say that you never know what will happen, but I don't know about a liver donation chain that leads to being a kidney recipient.