Since you can use in-line Perl if you really want to, there is nothing you can do in Perl that you can't do in TT. However, the point of a templating system is to separate your code from your presentation. You want to do processing stuff in perl, where it is most easily expressed, and presentation stuff in TT, where it is most easily expressed.
The requirement to "do it all" in the template is misguided, and I'd suggest you try to find out who came up with that and why. It will work, but it makes your template more complex and possibly too difficult for a non-programmer to modify.
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