A Japanese F nib made into an italic is not worth the trouble imo. You barely see the line varying and the pen would be paper grabby and have a small sweet spot. .01x prettier line. 100X harder to use. Western F italic nibs are already much wider than what you would see by turning a Japanese B into an italic. I have Italic sets from Pelikan and Sheaffer and the F italic there is already wider than the B Jowo nibs turned into Italics I have from named grinders. I have a Broad Italic (Masutama grind, pretty sharp, he even grinds dow the top of the nib) in my hand and the F italic from my Sheaffer is actual a touch wider.
YMMV but a Japanese F turning into an italic is just folly imo.
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