Sad to say but you may need to post in the regular analog section to garner any usefully responses.
Actually, you will have to go back to '50's and '60's decks to find ones that include a tape head output. And finding dual outputs may be even harder .... I don't know of any decks that feature that. Strike those from your list and you will still have to eliminate at least half (probably more like two-thirds) of the remaining decks because they don't have auto-reverse. One that I know does have it is the 1970's Teac 4070, and there are a few others as well.