looking for projected field functionality for a textbox similar to ootb lookup field

[SpeedBWild]

When a use enters data into a text box I want to also populate another field with the ID of the data they selected. I currently have a autocomplete textbox bring back a list of items from another list. The list I am pulling data from is to big for a dropdown box and a lookup field is to slow. But, I like the projected fields that the lookup field offers. Is there any way to add a projected field to the display list when using a textbox.

Any help would be appreciated.