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Would it be possible to use Starlink for comms if a sat is flying in a lower position?

In theory, yes.

In practice, this will depend more on my negotiation skills when talking to Elon Musk and less on any technical challenge :)

No, it will not be possible, no matter what Elon says.

Starlink operates in portions of the Ku and Ka bands that are reserved for Earth-to-space comms, not for space-to-space comms.

My impression was that Starlink relies on inter-satellite links to route traffic. We can use the same links for our own extended network.

The current satellites do not have crosslinks, and in any case, in their FCC filings SpaceX talks about optical crosslinks, not RF.