We already have business cards prepared that will be included in TD packages for distribution to non-members which explains what they have to do to become a supporting member. The card gives the following URL, and that page very clearly states that new supporting members "are still required to pay the $10.00 non-member fee at all PDGA sanctioned events until becoming a full member."
Nothing has changed on your end. How do you currently handle non-active members? You will handle the new supporting members the same way. If you want simplicity, ask to see their current PDGA card at registration and if they do not have one, they are subject to the non-member fee. Same as it has always been.