The little requirement that your project has to be multi-user may have merited mention in your OP.

And as to your associated new question -- writing your own language -- I don't see how an eviscerated Perl can still provide even the functionality you've described. So maybe a new language has potential; maybe you simply need to code up a better sandbox; or maybe you should reconsider the design, aiming for a Q&A thread relying on users' machines for the computations.

In reply to Re^3: embedding a safe unescapable mini perl interpreter? by ww
in thread embedding a safe unescapable mini perl interpreter? by iaw4

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