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Someone mentioned Tannus up thread: https://tannus.co.uk/
I use 1kg/ea vert ramp tyres on my Kona so they may as well be solid tyres :D
Semi-solid tyres have been around for decades (well solid tyres since bikes were invented).
They were popular where I grew up because of the jacks and puncture weed and it's flat so the fact they're dead and slow didn't bother anyone because they didn't have to stop 5x on a ride to fix p_nct_res.
I assume there's some newer, nicer ones these days (I'm thinking blue foam for some reason)