So here is the final question and million dollar question. I spoke to my breeder and she has a female green singer. She is willing to let me try it out and see if that helps Birdie Bird. She also mentioned maybe getting a grey singer and having him in a separate cage and hope that his singing will encourage the other one to sing. Or lastly, buy 2 less expensive finches and put them in with Birdie Bird for company.
My fear of adding a female is that he now really won't sing because he has nothing to sing about (he has the girl!).
My fear of buying a male singer is that he is going to get lonely eventually like Birdie Bird and I will have 2 lonely birds!

My fear of buying 2 less expensive birds is that it won't help and I will have 2 birds that I really didn't want although they are kind of cute when they groom each other.
See this all started because I work from home and the days are very quiet. I wanted a little friend who would sing in the morning and wake me up and while I was doing my work, he would flutter and play and sing. Silly I know.
If I bought the grey singer, could I put him in the same cage as the green singer with a divider? My cage is large enough to do so.

All the help is really appreciated!