It looks like this is almost working (in your latest GitHub release). Its just that the url to bear needs UTF8 encoding (to replace spaces with %20). Happy to attach pull request, but it seems to work with two quick changes:

Replaced the bash code following the bst script filter with:

query="{query}"

if [[ $query == ":t:"* ]]; then
	printf "bear://x-callback-url/open-tag?name=%s" "${query:3}"
else
	printf "bear://x-callback-url/open-note?id=%s" "${query:3}"
fi

Fed the output of this into a new 'Open URL' block.

Spike on how multi-word tags are going to work #3

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