I have a client that does exactly as you describe. The invite email and landing page are in Marketo and everything else is done in GTW. Its a very simple set up. Here is the Marketo How-To Doc: Create an Event with GotoWebinar - Marketo Docs - Product Documentation
Hopefully this will help, but as long as you have the 'co-worker' as Marketo in GtW then the 2 way sync will work perfectly fine.
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This is totally possible, and pretty standard. At my old company we used Marketo for the confirmation and reminder emails, but it was extra work to set up, and I don't think it helped our attendance. It's fine to use GTW's emails even when you get all set up, that's what we do now.
Slightly unrelated: One thing I do recommend once you start doing a regular cadence of webinars is to set up a fully tokenized program template. It will make setting up new webinars so much faster! Here's an explanation: How to Build a Marketo Webinar Template that Scales: Etumos