The issue is that RFC8200 forbids even modification to any EH unless the node is a destination node in top most IPv6 header.
If there were no resolution to the insertion question vis a vis RFC 8200, > then would it then suffice to recommend that ingress nodes should include > some padding for these non-SR midpoints to play with (iff. the network has > such midpoints), and otherwise abide by RFC 8200? >
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