For the curious: the answer to my subsequent investigation regarding the Providence meeting is “yes.” It’s possible to steal the 1945 Paladin and place it at the table suit only. Yates’ wine glass is also poisonable. Yates doesn’t seem to want to start giving his speech unless 47 is nearby, so I snuck out of the room, went back outside, and snuck back in through the persistent shortcut door on the north side of the villa. This gave me a hiding spot where I could listen and let the meeting play out normally. I was even able to poison his wine glass before I placed the wine.
However, I’m not sure it’s feasible to use this for a SASO run. Listening to the waiter tell the sommelier that Yates wants the wine seems to trigger the guests to gather at the basement table, and it would be no small feat to place the wine without them noticing.
EDIT: No, wait, I think it is feasible. I figured out how to get there fast enough with the 1945 Paladin before the guests arrive. Now it’s only a matter of making sure the guards are sufficiently distracted, which looks a lot easier.
EDIT 2: I managed to record a decent video of this method. I’m uploading it now.