Follow up
Just to tidy away this discussion thread for the possible benefit of others in the same situation, I downloaded the current version of GStarEX Capture and lo and behold, it worked in conjunction with Easycap including most importantly the ability to limit capture frame rate to as slow as I wished (in this instance 1 frame per 10 seconds), which for whatever reason virtualdub would not allow (only 25fps possible), and I managed a quite reasonable stacked image of the Sombrero as my first result.
So in summary, Easycap + GstarEX capture V3 + Stellacam3 allows variable capture frame rate.
Thanks to all who offered advice along the way.
Andrew
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