The normal kernel-module based systemtap backend may be more than your script requires. Try stap --runtime=bpf and/or stap --runtime=dyninst backends. Though they have inherent limitations, they operate with lesser privileges and perceived risks.
It may be possible to disable secure/lockdown measures temporarily with the SysRQ+x keystroke, or permanently with sudo mokutil --disable-validation and a reboot.
stap(1), http://sourceware.org/systemtap/wiki/TipExhaustedResourceErrors, error::fault(7stap), error::reporting(7stap) warning::pass5(7stap)