These non-Angel cards do not quite fit within the team related umbrella - but will likely be added into my all-time team register collection as guys who end up having these obscure stints with the team as bit players before moving on.
My team register collection is basically one more way for me to do something with loose cards that come my way and see how many different subjects I can add up - maybe completion isn't a realistic goal, but it might be good enough where I can add assorted cards of different players and see where I have 200-300 different subjects.
Maybe I'm spreading my interests too thin where this overlaps with my Angels all-time autograph collection - but maybe my all-time register is more of a side project.
Matt Duffy  seems to have devolved from upstart big leaguer at the beginning of his career into basically being a replacement player - it probably will be the case where if I end up with an Angels Duffy card [he does have at least one in 2022 Topps Update], the non-Angels card gets bumped off somewhere else.
Austin Romine  has bounced around in the big leagues, but like Duffy, ends up being a veteran who will still have cards made as long as they are in the big leagues and part of the MLBPA - however I don't think his three game stint with the Angels this past year will be immortalized on cardboard.
Elliot Soto  ends up being the most obscure of the three, where he is more of a longtime infielder in the minors - who was basically rewarded with a big league call up during the 2020 pandemic season.
While Soto has some draft pick cards with the Chicago [Cubs] from 2011 - it was like a reward to do a random search off a seller's ebay store and find a team set card of his I made a keeper for a dollar.