I've got a pair of Sim Works Hommage, they've got a thick flat edged bead like a tubeless tyre should, but I haven't mounted them as I'm still waiting for my bike to arrive to put them on.
I've had Homage tyres tubeless for a year and a half without any issues.
The bead on 28mm gravel kings is exactly the same.
@Jaap started
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I've got a pair of Sim Works Hommage, they've got a thick flat edged bead like a tubeless tyre should, but I haven't mounted them as I'm still waiting for my bike to arrive to put them on.