Looks like Death's Head may not be an SDCC exclusive after all. Hasbro put out a press release a few days ago summarising their SDCC offering and they made a point of not describing Death's Head not as a convention exclusive, but as a 'first to market' figure that will debut at SDCC.
I'm guessing he'll get another release in the near future, probably in more standard deluxe Legends packaging.
https://newsroom.hasbro.com/news-releases/news-release-details/hasbro-returns-2024-san-diego-comic-con-international