Definitely understandable – it’s not been built in such a way as to readily accommodate this, however.
Though a bit of a hack you could potentially catch the filter bar output and replace the ‘tribe_’ prefixes, then catch all incoming requests and map your custom form back to what the plugin expects. While not ideal it could work if you’re in a pinch, though we’d need to leave it to you to figure out the details.
Beyond that, please do post a feature request and we’ll happily consider this, especially if others also show their support.
Thanks!