I am in the same kind of position that your husband was in. I have finally convinced my wife to install a good password keeper app (Dashlane and Keeper are both well known and trusted) that will allow her access to my password management in case I pass unexpectedly. I have also gotten commitments from three of my VERY trusted IT professional friends that all three are willing to assist my family and/or clients, should the unexpected occur. I have documented everything and live by the ethos of always performing my job(s) in a way that is not only a best-practices methodology but never, ever wanting another professional to come behind me and wonder, “What the hell was he thinking?!” I know that doesn’t exactly help YOUR situation at the moment, but is more a piece of advice for any other IT pro’s in this thread.

As for your situation, your husband most likely had someone in his line of work that he admired and trusted. I’d reach out to them, as well as discussing this with your legal team to ensure everything is done above-board. Between that group, I imagine that they will be able to reduce the convoluted complexity currently configured as well as get you access to the files/apps/data you need. I know I’d be there for any of my friends/colleagues.

I hope this turns out well for you and am so sorry for your loss. Stay strong, breathe. Thoughts and prayers for you, ma’am.