INW-Am4a is my go-to pipe concentrate. I like it, as a single flavor mix, at 3.5%. It is a good straight up (unflavored) pipe mix. you could easily add the fruit note of your choice (apple, cherry, berry, etc.).
I would probably start with something like this:
2.5-3% INW Am4a
and
1-2% of your preferred apple concentrate
Adjust to your liking from there.
NOTE: INW Am4a was named after, and made to mimic, this pipe tobacco:
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which often include descriptions similar to this one:
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I have not smoked Amphora; so I can't speak to Inawera's accuracy. I can say, that I find it a dead ringer, for the way I remember Half & Half pipe tobacco tasting. I love it!