Thank you, that solves this!
<p>
Which is very strange because earlier in the script I 
<pre>
   namespace import ::blt::*
</pre>
and it has always been sufficient (i.e. it WORKED) under native wish (tk 8.5.*) on the same machine, but failed if invoked with undroidwish/vanillawish.
<p>
With the explicit ::blt::zoomInfo, it finds the stack under both.
<p>
Thanks again, we can close this ticket!