No freakin way. That would be a great way to ruin a long traditional world respected sports car race.
The Nascar "rubbing is racing" is not a worldwide mentality. The Endurance Series is getting more F1 attention/drivers lately, they ain't going to be a part of that, no way. If the Nascar boys want to join the fun, let them try TA, let them have a Sat morning 3hr? warm up support race before the 24 hr.
Or bring back the original Paul Revere 250 night race on the Friday before the 24 hr.
Besides the track is not designed in the infield section for drivers out of driving talent with heavy vehicles learning road racing in competition with relatively delicate GTP cars on track without much more robust fencing and walls and/or moving the spectators further back, and all for what?

https://www.msn.com/en-us/sports/ot...the-imsa-rolex-24-at-daytona/ar-AA1yhZRs

http://www.ultimateracinghistory.com/race.php?raceid=2248

There are plenty of Cup & Xfinity series drivers who are good at road courses, and that Camaro that Hendrick ran at LeMans was a capable piece as well.
It was also a fan favorite, and that's in France, at a decidedly Euro-centric event.
That said, even though there was something similar at the Daytona/Rolex/whatever 24 - maybe when it was called the Continental - I don't see a pressing need for it.
As far a NASCAR races, the rubbin'/racin' stuff is mostly short-track - I rather enjoy the super-speedway chess-game, but my favorite is when they put those cars on road courses.

All your points have merit. The problem would be with the Cup driver that is learning road racing on the fly.
The recent Lemans effort was a favorite of mine also, but they weren't really racing, it was really more of a fast well-prepared oddity on the track during the race, much like Roger Ward was a fan favorite in his Offy Midget at the first F1 race in the US at Sebring in 1959.

I would watch with interest a Cup car real endurance road race, night, driver changes, no lucky dog, no weather delays. etc but combining it and adding another class of drivers/cars on a circuit of already filled with cars of a completely different mindset is IMO dangerous and makes no sense in the big picture.

IMSA has Pro & Semi-pro driver classifications (Gold & Silver) but Cup doesn't, and this season also did away with the "rookie stripe".
So yeah, they'd require vetting, and the in-race regs differ too.
But in any case I'm not aware of a Cup/Xfinity car invasion there, so no worries.