Think you would be better asking in almost any other section of the forum except songwriting/Lyricists corner but let's give it a go.
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connect my neve 1073 spx to my apollo 8 bypass the apollo preamp
1073 XLR out to a TRS line input on the Apollo
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and connect my Avalon 737 as an insert
As an insert to what?
Sending and returning from the DAW or inserting to the 1073 so the mic is going through both before hitting the DAW?
Phantom powers the mic so whatever is acting as you mic pre needs phantom on.