The only requirement to have your Wistia embed work on an AMP page is to include the following script:
<script async custom-element="amp-wistia-player" src="https://cdn.ampproject.org/v0/amp-wistia-player-0.1.js"></script>
Then you can wrap the Wistia player in an amp element like how this video is embeddeded:
<amp-wistia-player data-media-hashed-id="abc123" width="700" height="394" ></amp-wistia-player>