On line 33 of rocket-silo.lua, there's:
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if not (rocket and rocket.valid) then return end
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local silo = event.rocket_silo
if (silo and silo.valid and silo.name ~= "rocket-silo") then return end
There's still the achievement which would probably get raised for non-rocket-silo based launches
Launching a cargo pod might provide a way this, but it is a lot more moving parts than a generic inventory for a rocket silo (is launching cargo even possible without SA?)