[ANSTHRLD] link to pics for the devices in question

[Teceangl]

The ermine variants cannot be counterchanged, as 'counterchanged'
requires some sort of field division to be valid.  All counterchanged
means is 'the charges on this side of the field are the tincture of
the other side, the charges on the other side of the field are the
tincture of this side, and anything straddling the line of division is
divided to match'.

You cannot counterchange' a fur from one variant to its opposite over
a charge.  You can put a fur on its opposite, but that requires that
all the spots are wholly on the charges.

This is the closest ruling I can find:
As a general rule, ermine spots drawn on charges were usually whole
spots arranged to fit well on the charge (even if some of the ermine
spots needed to be made a bit smaller than usual, or tilted slightly,
to fit in their alloted spaces). In contrast to the practices for
ermine spots on charges, ermine spots on fields in period were not
infrequently drawn with the spots cut off at the edge of the shield or
at the edge of an overlying charge. [Robin Gallowglass, 04/03, R-East]

There also this one:
[roundels ermine] Please advise the submitter that, as a general rule,
ermine charges in period were drawn charged with whole ermine spots,
rather than having the spots cut off at the edge of the charge. (This
is different from the practice for ermine fields, which commonly had
the spots cut off at the edge of the shield.) [Finn Folhare, 04/03,
A-Æthelmearc]


I'd say without documentation of ermine spots lying partly on a charge
and partly on the field, particularly since ermined furs are tinctures
in their own right (making the something like trying to bleed azure
from field to charge over an outline or something), this would be
returned. Put whole, uncut spots on the charges and it's registerable.

- Teceangl
-- 
Head returns off at the pass -
http://heraldry.sca.org/heraldry/laurel/boing.html