Seeking Google Drive to Confluence migration advice

Im coming from an 1000 person global company and just started at a small org of < 150 people. It’s ed tech but there isn’t a ton of PRDs or agile ceremonies the documents are mostly operational, SOPs, project plans, policies, trainings etc.

They have a Google drive that isn’t terrible with each of the 5 major teams with its own folder and then some other resources scattered about, an older attempt at a wiki that has some decent info.

I have to put forward a proposal on a plan and everyone seems very concerned about “who will get served first” and seems to think they have a ton of documents and that their product is “extremely complicated” (it’s not).

Am I delusional for thinking I can just get buy in. audit, archive, sunset and ship an MVP of the migration for the whole org’s key resources in 90 days, host an enablement and then have smaller quarterly milestones for the loose ends?

Would love anyone’s insight who has done a project around this size (200-400 docs) for 5 teams / 150 people