Filtering categorized content in perch_content_custom

I would like to display all FAQs on a primary FAQs page, but also display select ones on other pages through the site.

To do this I have created a category set, and am trying to filter based on that without:

1. displaying cat=abc in the URL; or
2. without having to hard-code the category slug in perch_content_custom

FAQs region on the /more-info page includes the perch:categories tag using the "massage-therapy-techniques" set:

<perch:categories id="techniques" label="Related technique(s)" set="massage-therapy-techniques" help="Set to display on a specific technique page" />

On individual "technique" pages, I call perch_content_custom:

<?php perch_content_custom('FAQs', array(
'template' => 'faqs.html',
'page' => '/more-info.php',
'category' => 'massage-therapy-techniques/systemic-deep-tissue-therapy',
)); ?>

Which works as intended, as long the category => is hard coded, OR if I have a URL like:

example.com/massage-therapy-techniques/systemic-deep-tissue-therapy?cat=massage-therapy-techniques/systemic-deep-tissue-therapy

And I use 'category' => perch_get('cat') in the perch_content_custom call. But that string looks pretty goofy, and hardcoding it isn't practical in this instance.

What I would like is to use:

<?php perch_content_custom('FAQs', array(
'template' => 'faqs.html',
'page' => '/more-info.php',
'category' => perch_get('cat'),
)); ?>

And end up with a URL like:

example.com/massage-therapy-techniques/systemic-deep-tissue-therapy

I suspect this comes down to a rewrite rule of some sort, but I am getting nowhere. Can anyone provide any insight into how this may be done?

Cheers!