Adding data to input field with user input

I want to be able to have the player click on a list of possible entries for a word in the text they are typing in. It works up to a point. I have to re-click on the input field after clicking on the list. I tried setting the input field to selected, but that hilights the entire text I want to preserve and make it go poof with any input. It also didn't actually move the cursor over so I could keep typing, I still had to click into the field.

And the other problem is that if there is more text in the field (multiline) even though after each modification I have MoveTextEnd(true). Using arrow keys to get to the end cuts off the beginning.

I realize I'm pushing the boundaries of the input field, but any help on how to get this to work would be delightful.

P.S. It would be lovely if there were a list of tags I could use to find one that worked since neither UI nor InputFiled work.....