Since the Maestro who has appeared in this arc has been shown with Doctor Doom's Time Platform, he might be Bruce Banner (Earth-TRN589). He appeared in Spider-Man 2099 Vol 2 #9-10, where he learned how to use Doctor Doom's Time Platform from Spider-Man 2099, ending up on Earth-616. Thoughts?
Duellante magic (talk) 20:53, November 1, 2017 (UTC)

I asked Ed Brisson if they're one and the same on Twitter, but he hasn't answered yet. Anyway, that doesn't seem to be Doctor Doom's Time Platform.
--TMAO (talk) 21:12, November 1, 2017 (UTC)
The Maestro mentions that he actually stole that machine from his timeline's Doctor Doom in this issue's flashback, and I cannot think about any time-machine built by Doctor Doom other than his Time Platform.
Duellante magic (talk) 21:20, November 1, 2017 (UTC)
That doesn't make this machine a Time Platform, even because it isn't (unless the Maestro modified it at some point).
--TMAO (talk) 21:35, November 1, 2017 (UTC)
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