The two issues, as I see it, are -- dipping in the mikvah, and any transfer of non-kosher taste.
As for the mikvah -- if it belongs to a non-Jew and the Jew is just borrowing it, there's no obligation to dunk it. The obligation is only on Jewish-owned vessels. If the lender doesn't mind, I suppose you could borrow it and kasher it, which would take care of ...
A number of kashrut certification agencies (led by Star-K and the OU) discovered that plastic packaging material suppliers were using animal-based additives (e.g., tallow, animal fat) in the plastic resins (e.g., as lubricants) and that these additives could migrate into the food. Interestingly the Food & Drug Administration requires these chemicals to ...
The question is if a glue that is strong anough to make them utensils give them a status of Keli cheres despite they are not baked. Maybe that we have a proof that it is not the case from the Mishna 11.4.
וְכֵן מִן הַחֲלָמָא וּמִן הַגְּלָלִים.
And similarly for a mixture of white earth and dung that plays the function of glue and is itself a ...
Rav Ovadia M'Bartenura writes (ibid):
(Source from Sefaria)
משיצרפם בכבשן. וקודם צירוף הן כלי אדמה ואין מיטמאין
When they are baked in the oven: And before this baking, they are earthenware [i.e. not clay] vessels and are not suseptable to Tuma
Based on this, air dried clay vessels would not be susceptible to Tuma.
Hope this helps!
Dairy bread is not uniformly forbidden, there are two exceptions (from OU here)
Dairy bread that has a unique shape is permissible because the shape will serve as a reminder that the bread is not parve
One may bake a small portion of bread which will be consumed in one meal, as it is assumed one will remember the meat status without difficulty.
As such I ...