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That is correct, pre-fill and other form options will be limited even using embed code on external sites. You could use iframes or build an API form instead.
As for tokens, you are out of luck if you do not use a marketo hosted page.
Keep in mind that Marketo now has Guided Templates that allow you to turn off rows and full responsive. I'd take a hard look at that before staying with unbounce.
Marketo does allow AB Testing of pages, however, detailed functionality isn't there, so that may be a reason to use unbounce.