The ideas are great, but the difficult part might be building it cheap enough. Get some good market research before you spend too much money on the project. Sure you can build it, but they may not sell. Lack of market research is very common with inventors. Even if something is a good idea, it may not sell well enough to recover investments in making it. Even if something is patented, it still may not sell.
I personally would pay a relatively high price for one that worked very well. But I don't know of anyone local that would. I see a lot of riders in the summer when ocasionally running, or working at, a couple of bike shops around here when the owners are not around.
Most people at the bikes shops around here would not even spend $19.95 for a PB Superflash. Most cyclists do not ride at night and think that the price of an accessory should be much less. More like $10 or less.