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well there is - it's just not a node.
you can use mux
so if you had two clips that you wanted to interleave you could timewarp each clip to 50% mix 0.0 and then use a cycled animated switch on mux node to swap between input 1 and 2.
retime and remix the ingredients for interleaving more than two sources.
or do it in action
or dissolve
or any multiple input node
but yep, interleave has been requested before...
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