engine - 6:00 pm on Aug 2, 2000 (gmt 0)

The way the results may be presented from a SE mostly relates to the content in the site. Store the alternatives in your own site (being careful not to inadverently spam the engine).
Linguistic technology has come along really well in recent years, although I'm sure it would raise the bar of complexity significantly.
I've done some research, at the beginning of this year, to try to identify this on the SEs and, as yet, i've found nothing that suggests it works (if it's there at all). I'd guess it is only another layer of complexity for the engineers at the SEs.

My research: With almost 200 searches, studying the top five results in each return from AV, Infoseek/Go and Lycos. That's about 3,000 pages of text with meta tags, the only link was where the meta tags had the information.
I don't fancy doing that lot again.