This uses StartExecEx to get the equivalent of ExecStart=:. StartExecEx was added in b3d593673c5b8b0b7d781fd26ab2062ca6e7dbdb, so this will not work with older systemds. A hint is emitted if we get an error indicating lack of support. PID1 returns SD_BUS_ERROR_PROPERTY_READ_ONLY, but I'm checking for SD_BUS_ERROR_UNKNOWN_PROPERTY too for safety.
System and Service Manager
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