You are not the only one with an only cat. My cat prefers to be the only cat in the house. She is 14 and set in her ways. She has always been territorial with the neighbors cats coming into our yard. When she was a 1 year old she stayed at my in-laws house with their 2 older female cats and bullied them so they both hid under the beds while she was there.( she was there for a week while we were on our honeymoon)
I think that male cats and younger cats seem to do better at accepting a new kitten in the house. It does depend on the individual personalities. Good luck to kgeorge, try it and see if it works, you never know until you try. I have tried and my cat said no.