If it's not Shaw, the obvious choice to me is either Moritz Neuhausen or Kledio Kaci. The team needs a little youth.
Neuhausen won the European Open this year, but Kaci has been more conistent throughout the season. Won some smaller ranking events and has had a lot of deep runs.
Certainly reasonable, but right now, neither is playing as well as Alcaide. Once again looking at current form, I'd go with Big Kaci over his brother, after a third at the WNT Florida Open and a second at the World 10ball.
Give me players currently in form.
Finally, when it comes to selecting teams for an event in which beating the most elite is required, I don't place much meaning on who performed at the satellite events (even though a couple of them had superstrong fields). Performance at the majors is a much better indicator of who will perform in a match against the most elite. Hence, I'd take Moritz, European Open champion, over Kledio right now.
Still, Szewczyk, WPA #1 right now, won the World 10ball and was second at the UK Open, showing outrageously strong form at each. He'd make Team ROW much stronger.