Forn Pre-Fill Workaround

Hi guys,

I am trying to create a referral form that would allow people to submit their info (Name, Email, Phone) and then their Referrals information below. The second time they access this page, I want the form area for their info to be pre-filled, so all they have to do is update their referrals information. This would be a Marketo form on a Marketo landing page. I would have all the information that I want to populate in Marketo associated with their contact record. 

I know that as of 4/19, the standard form pre-fill option is no longer available.  Is there a workaround in place to get this to work?

Thanks - Ashley