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The heat treatment method will be very tricky for this, because dimensional accuracy is so important. If you can get it right it would be most excellent, though.
Looking at your temperature tower, I would use 195, and it might be worth trying a lower bed temperature. I use 50 for mine, as it improved the quality on lower layers, but results vary a lot... You might want to try doing a few test prints at different bed temperatures, it might make a difference. I use benchy for that test, I am building up a very impressive fleet of the useless little boats :-)