In reply to:

As an addition to this..., it would be nice to be able to have a static image layered behind the animated images ... so that features such as a L and an R could be displayed

It might be simpler just to have separate Left and Right multiframe images.
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Toby Speight
030103016 (80GB Mk2a, blue)
030102806 (0GB Mk2a, blue)