Thanks for your good advice. I have adapted your approach in a slight modification where I introduce an indicator whether or not the recursive function is called from itself or from the outside. In the latter case, it starts threads otherwise it just calls itself within the same thread. This is at the cost of an additional if which I hope is not material (I have not run any benchmarks).
As a consequence, the script has successfully completed the restricted branching based on the shortest two or three next available edges (the latter took 12hrs), but it has not found any better solution than 84860.
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