Answer to "iPhone 4S screen on an iPhone 4 ( cdma )..."The 4 & 4s can universally fit each other. replacing the bezel is the best way, but if you don't have the time or the proper adhesive to re-seat the bezel to the glass, you can simply, cut off one screw tab on the bezel & and cut the end off of another & a CDMA screen will seat on a 4s frame.
Answer to "broken digitizer retaining flaps"I make use of a couple businesses that can replace that connector, both the Digitizer connector cable, or the LCD connector cable. We repair enough of them, that occasionally we come across a tab that just can't take another open/close without failing. Typical cost to properly REPLACE the connector with new one is around $30+/-. If a jimmy rig works fine, no worries. You can also find FPC Digitizer Replacement Service on eBay... you ship them your iPad, they make the repair, they ship it back. Just pay attention to their feedback, they might have 1000+ positive feedbacks because they used to sell mops... now they "he/She" is repairing iPads... make sure they have a nice established positive feedback pattern for THIS repair.