Blu-Ray on normal DVDs

Hi, I make wedding videos and have had my first request for the finished film to be Blu-Ray. I don't possess a blu-ray burner and as I am closing my business and this will be my last job then I do not want to spend a lot of money on hardware I will never use again. I recently saw an article that said I can burn HD video to a normal DVD using toast with their Blu-ray disc plug in. Does anyone know anything about this.
My recorded footage is on: Sony Ex1 , shot- HQ 1920/50i, edited in FCP7, pro-res timeline. My computer is an iMac and I burn my DVDs on a sony external DVD writer.
My question is - does this really work and what quality could I expect. Also as everything seems to have it's pitfalls I wondered what they would be in this case. Any thoughts, advice or insight as to the working process on this would be much appreciated. Regards BRIAN

brian paterson