You can still use the newer AUI versions as for example described here. To use jQuery just manually embed it as well.
<script src="https://connect-cdn.atl-paas.net/all.js" type="text/javascript"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js" type="text/javascript"></script>
<link rel="stylesheet" href="https://unpkg.com/@atlassian/aui@8.6.0/dist/aui/aui-prototyping.css" media="all">
<script src="https://unpkg.com/@atlassian/aui@8.6.0/dist/aui/aui-css-deprecations.js"></script>
<script src="https://unpkg.com/@atlassian/aui@8.6.0/dist/aui/aui-prototyping.js"></script>
Hope that helps! 