Spoonerisms don't have to be the first letter..
.. but can well be the first sound. They're more phonetic than spelling.
( teedyay, Fri 26 Oct 2007, 12:05, archived)

which in this case makes no difference at all
there's still an 'r' too much
( pzyko vs the truth about electric can opener reviews, Fri 26 Oct 2007, 12:10, archived)

carr aloft


blimey
( The Snockerty Friddle, Fri 26 Oct 2007, 12:31, archived)

I still wouldn't flip it like that, even speechwise, but fair enough.

( pzyko vs the truth about electric can opener reviews, Fri 26 Oct 2007, 12:47, archived)

some of the classics by dr spooner did
so it is a valid spoonerism
( cumquat may because you're mine, I walk the lino, Fri 26 Oct 2007, 12:54, archived)