Feel like you start to lose a little of the plot when you start talking about fWAR production from the DH spot with the built in defensive penalty, but still think it shows just what's required to stand out from primarily playing in that slot.
In total, you had four players generate more than 3 fWAR from the DH spot, all of which had an wRC over 150. After that, Judge (in 56 games, lol), Trout, and Yelich put up between 2 and 3. Trout with a 134 wRC in 463 PAs, Yelich with a 122 in 560 PAs (and positive baserunning).
Going off your general stat ranges, the comp that stands out is Yandy Diaz: 496 PAs, .283/.347/.451, 121 wRC, 19 HRs, 1.7 fWAR. Marcell Ozuna (114 wRC, 584 PAs, 1.2 fWAR) and Suzuki (109 wRC, 444 PAs, 0.9 fWAR) were much more walk heavy than BABIP heavy. Rooker and Polanco have too much power.
I'm fine with them passing on Suarez, even at the one year contract he signed. I'd love if there was an option in the 1/$8m range that could hit RHPs well just to give Ballesteros 100 games behind the plate in Iowa. I just don't see a path to an elite bat in what he's done so far, so it's a pretty low ceiling if he doesn't have a position. Nathaniel Lowe kinda collapsed last year in a full time role (wRC by year: 143, 118, 123, 91), but most of that collapse was because he had to face LHPs (41 wRC against LHP vs 111 against RHPs). Winker has a career 128 wRC against RHP but might be cooked (94 wRC last year). Probably not a good option out there.