One premise of this hypothetical analysis has now come true. https://www.lawfareblog.com/presidential-succession-nightmare">https://www.lawfareblog.com/president...
If you want to get up to speed quickly on the constitutional debate, I would start with this article by the Amar brothers. https://digitalcommons.law.yale.edu/cgi/viewcontent.cgi?article=1959&context=fss_papers">https://digitalcommons.law.yale.edu/cgi/viewc...
I would then read the response by John Manning. https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2854357">https://papers.ssrn.com/sol3/pape...
Here is the report on this by a bipartisan commission a decade ago, under the veil of ignorance, so to speak. https://www.brookings.edu/wp-content/uploads/2016/06/06_continuity_of_government.pdf">https://www.brookings.edu/wp-conten...
And here is the best contemporary take on the view that the succession statute is constitutional, by @JoshMBlackman and @SethBTillman. https://www.theatlantic.com/ideas/archive/2019/11/2020-election-could-pit-pelosi-against-trump/602308/">https://www.theatlantic.com/ideas/arc...
This book by Brian Kalt has a good chapter on the problem. https://yalebooks.yale.edu/book/9780300123517/constitutional-cliffhangers">https://yalebooks.yale.edu/book/9780...
Other relevant analysis:
https://scholarship.law.edu/cgi/viewcontent.cgi?article=1237&context=lawreview
https://scholarship.law.edu/cgi/viewc... href=" https://harvardnsj.org/wp-content/uploads/sites/13/2020/04/Tillman_Why-Strict-Cabinet-Succession-Is-Always-Bad-Policy.pdf
https://harvardnsj.org/wp-conten... href=" https://www.everycrsreport.com/files/20081003_RL34692_23adce9970abd6658fdfb322316c2ac32f3660b5.pdf
https://www.everycrsreport.com/files/200... href=" https://law.hofstra.edu/pdf/academics/journals/lawreview/lrv_issues_v39n03_cc-1-albert-final.pdf
https://law.hofstra.edu/pdf/acade... href=" https://www.jstor.org/stable/1229153?seq=1">https://www.jstor.org/stable/12...
https://scholarship.law.edu/cgi/viewcontent.cgi?article=1237&context=lawreview
https://scholarship.law.edu/cgi/viewc... href=" https://harvardnsj.org/wp-content/uploads/sites/13/2020/04/Tillman_Why-Strict-Cabinet-Succession-Is-Always-Bad-Policy.pdf
https://harvardnsj.org/wp-conten... href=" https://www.everycrsreport.com/files/20081003_RL34692_23adce9970abd6658fdfb322316c2ac32f3660b5.pdf
https://www.everycrsreport.com/files/200... href=" https://law.hofstra.edu/pdf/academics/journals/lawreview/lrv_issues_v39n03_cc-1-albert-final.pdf
https://law.hofstra.edu/pdf/acade... href=" https://www.jstor.org/stable/1229153?seq=1">https://www.jstor.org/stable/12...
Also worth including: Acting attorney general McGregor& #39;s 1947 letter to the chairman of the House Judiciary Committee, concluding that 1947 Succession Statute is constitutional because members of Congress are “Officers” under the Succession Clause. https://assets.documentcloud.org/documents/6818250/GPO-CRECB-1947.pdf">https://assets.documentcloud.org/documents...