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<p>Why don't you use <tt>trail_visibility=no</tt> on the sections
of path which are invisible as they are just plain beach? Routing
will not be affected (<i>it will work...</i>).<br>
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<p>See: <a class="moz-txt-link-freetext" href="https://wiki.openstreetmap.org/wiki/Key:trail_visibility">https://wiki.openstreetmap.org/wiki/Key:trail_visibility</a></p>
<p>Cheers,</p>
<p>Sergio<br>
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