The development version of the plugin allows you to specify the URL to use, but you would have to manually include the TAG as part of the URL so you wouldn’t gain much.
The current version will let you manually create your links, so its pretty labour intensive but you keep the localisation:
In the shortcode:
[amazon template=manual&url[uk]=https://www.amazon.co.uk/Bestsellers-Electronics-Camera-Photo/zgbs/electronics/560834&url[us]=https://www.amazon.com/best-sellers-camera-photo/zgbs/photo&title=Bestselling Cameras]
With a template containing something like:
<div class="al_found%FOUND%">
<a href="%URL%?tag=%TAG%">%TITLE%</a>
</div>
Make sure the template is set to Type “No ASIN”.
That might do what you want?
Paul