You are opening up yourself to big problems by giving people access to unsorted, unedited and uncensored images straight out of your camera.
The key difference between a professional photographer and a snapshooter is quality control. You will be giving that priviledge up with what you are proposing. You are also contradicting yourself by your own admission;
...where the (client) doesn't want crappy cellphone photos to be posted up first by their guests...
Yet you'd rather give them access to all your crappy photos?
Before you take offense -- we are all photographers here. We all know not all our images are worthy of seeing the light of day. Remember that your ability as a photographer will be judged on what the client receives. If they have to sift through muck to get to the gems, how's that going to make you look?
I can just hear the conversation behind your back. "You paid how much for this guy to take pictures? Hell, I could have done this for free with my camera."
By giving immediate access to unculled and unprocessed images you are doing nothing more than what Cousin Suzie would take with her P&S camera and upload it to social media. And, no, what you are planning isn't going to curtail or even beat the speed of Uncle Bob with his smart phone. Don't do it. Don't think about it. Don't waste a penny on the idea. Instead, take that energy and put it into delivering images Uncle Bob and Cousin Suzie could NEVER get with their P&S and smart phones.
After all, that's why clients hire a pro.