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I think you are going to have a very hard time with a diesel swap retaining the transverse transmission. I am assuming you have looked at a new R2.8 from Cummins, which I assume is too big to be mounted transversely.
I don't know the bolt pattern of the new 1.6L from the Chevy Cruise/ Equinox/etcetera but those would require a computer and electronics swap to work as well. Not for the faint of heart.
There are a number of people illegally putting tractor and generator engines in vehicles, but even most of those are based on the availability of a bellhousing adapter as I believe most of those are SAE engines.
If the Buick is your primary driver I would suggest you get a secondary car to do a swap in, expect large amounts of downtime during the transition. I ended up just buying a diesel Suburban for my "swap" which was more of a "refresh", no title or legality issues.
-Edit: And my family has had 5 Lesabres/Park Avenues so I am familiar with the platform.
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