I personally am against the idea of throwing new players who have no idea how the game works in the deepest end possible like this. Especially without a specialised quest to catch them up and drill in each gameplay element they will be unlocking. I like the idea on the grounds that people who played on one platform can use this to get to speed on this platform, but unlocking all the rewards? I don't think that far is necessary for what you want to do - which is get newer people faster access to the content they yearn to experience.
Here is my proposal: Drifter's Path.
Proposal's baseline:
Teshin's Cave + random gear + rental assets to act as a 'Drifter Path'.
This would skip having to force-unlock quests linked to getting to Whispers by providing a literal backdoor to entering any quest.
Tempestarii, or a Void-addled Railjack, would include an out-of-place fully-suited Drifter as a temporary crewmate to repair any damage acrrued.
The Archwing would be an unmodded default one, along with related weapons.
Snake, the unmoddable mech from Heart of Deimos, will stand in for the lack of your own.
These will serve in lieu of any un-owned requisites.
This route will be free, but require you to complete Duviri Paradox, which last I checked was available after Vor's Prize.
This would allow you to go into any quest with randomised gear from Teshin's Cave, Transfer out into Drifter with the Lotus Hand, and use their Sirocco.
You'd obtain the Quest's intended rewards. Secondary completion via the other Path will result in a large stockpile of resources as loot, rather than just a Riven.
Some quest elements may benefit from additional Drifter dialogue to smooth this feature over, or be locked behind other quests you can access via this alternative route:
Second Dream, Heart of Deimos, New War.
Completing Second Dream would be required for Operator customisation. Heart of Deimos to acquaint yourself with the Entrati. New War for obvious reasons.
These three are all you'd need to do in the Drifter Path to get to Whispers. Of course, there's one small drawback of this route:
Drifter Path starts you in Teshin's Cave, meaning your gear is randomised, and the provided Mech and Railjack are unmoddable. You'd also be Drifter with Sirocco.