I assume you're probably wanting to add the supps for the Plat Charge benefits more so than the points? If it's just the latter, you could always add different supps to the free Platinum Reserve companion card (which has limited benefits like Hilton Silver, 2x Amex lounge passes per year per Reserve account, as well as 1x Priority Pass account with two yearly visits, but which might have to be in the name of the primary cardholder only, haven't checked the fine print), and where points from any Plat Reserve spend can be combined into your main Ascent Premium account from the Plat Charge. It's one way of giving cards to up to 8 other people (4 from Plat Charge, plus 4 from Plat Reserve) without paying a second card annual fee or any supp card annual fees.