As rmpaq5 says, adding cards to checklists is very much a pain for those here who do that stuff. (Him and I are 2 of the handful who do.)
We like to request members do their fair share of research, to determine these things before adding items. This seems like a case where you, YoRicha, have done that. Please add the set, do not include the ones you have not been able to confirm, and if they do surface in the future, adding to the end is much easier than adding multiple cards interspersed throughout the checklist.
Thanks for going about this in the correct manner front start to finish. I'm confident I can speak for rmpaq5 here as well, we really appreciate members who do this level of legwork. Thank you!
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).