I have an iPhone 8 Plus and from time to time I make use of the MBraille app for writing using it's Piano Mode. Just wondering? Does there exist, somewhere out there, some kind of Braille keyboard one can fits over the phone screen? On a large phone like the 8 Plus I struggle to many times to get my fingers in the right posision. If I move only one finger a millimeter to the right or left I'm off target. LOL! I tried the other modes, but hate using them.