I don’t know about blueberries ripening off the bush but I grow red currants and they too are a bird magnet. I use nets. You could use anything such as old net curtains, protective plant fleece, any kind of lightweight fabric.

Net your bushes, it's the only way to get any fruit for yourself. I use a high quality braided net made for commercial growers. I've been using the same net for six years now and it is holding up well. I made simple U-shaped supports from plastic electrical conduit that are held up by pieces of rebar driven into the ground. The netting, which came in 20 x 100 ft pieces then makes a tunnel over each row of bushes. I can work inside the tunnel for harvesting, so it's not really in the way. It's important that the net go all the way to the ground and get anchored down so that it's completely sealed, lest you trap birds inside.

I had very poor berry set this year after getting a ton last year, and then was traveling for several weeks and didn't put the netting up in time. No blueberries for me this year, the bushes got picked clean while still mostly green.