IMO, this thread isn't getting the job done... the titling process is different in each state, the federal pressure put on the states around the time of "cash for clunkers" made it much more difficult to work with missing or open titles everywhere. 10 years ago there were lots of companies who would help get you a title, they advertised in all the magazines, most closed shop or faded into the background. Good news is it seems to be lightening up a little and I see there may be a possibility for you to get help.
I am no expert, but I see 2 possible courses of action. The cheaper route would be if you can find the rightful owner(s) of the car and get them to apply for lost titles and then transfer them to you legally. Once you are the title holder, covering up the VIN plate issue shouldn't be too hard with a repop (legality of this is another issue, but I get it..). Since the owner is deceased, you would need the rightful heir to help, like his spouse or children... It is a big can of worms you are opening here and they do have the right to take the cars if it all goes sideways.
The second way I see is to pay a private agency to help. The best outcome this will most likely result in will be state issued VIN plates and numbers and usable, but branded titles. I would expect this to cost at least a grand for each car... but it would be the only fully legal way I can see, and I don't know how many problems it will bring to the surface. 2 links to look at:
SOS - Titling and Registering Vehicles
Michigan Auto Title Services - Auto Title - Bonded Title - Surety Bonds - Tax Registration
It may or may not help to understand the more difficult titling came about under the guise of preventing "washed titles" after so many flood damaged cars from hurricane Katrina where sold throughout the country... but I personally believe the same clowns behind the "clunkers" fiasco helped push it as a way to kill off the tremendous numbers of "open title" old cars out there... IMO, this is tree huggers trying to kill off a little more of the old car hobby.
For future reference, while I know there are a lot of folks who still think they can fool around with titles as easily as they could in the past... Please don't do it anymore, it tends to kill cars. The only reasons I can see to leave an open title is tax evasion or curbstoning, which is pretty much tax evasion... Get all cars titled into your name from now on and you won't risk losing them. Around here, an overzealous code enforcement officer could cause you to lose an unregistered car on your property.