Okay, solved. Turns out to be simpler than I imagined.
I made a type="hidden" form field like so:
<input type="hidden" id="order-email" name="email" value="<?php echo $slemail; ?>"/>
Then pasted the string into a “value” attribute. The server processes the string on page load and sends the result to the form handler when the user submits the form.
Easy, peasy.
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