Shop rifts should accept flesh/charged gems and apply the same type of customizable pricing restrictions/discounts that are given to regular commodities and herbs.

Please?

You forgot Tarot cards, Rune stones, and Dreamweaving motes.

They already put flesh in their personal rifts, I think. So makes sense to extend it to allow it in shop rifts.

Flesh goes into your skin, I think, according to what I read on the LoreWiki.

Seems to me, if you can group flesh/gems like herbs, you should be able to price them like herbs.

Not all groupable items are riftable, see. That's the issue here. Personally, I think it's by design and not likely to change.

Gems and flesh go into special, separate rifts, like runes into runebags and motes into dreamcatchers, except that it's a skill rather than a special item.