Here’s the answer to the phone drying statements.
Some points are not applicable as you aren’t putting your filament in a pile of rice.
Rice can get stuck in your phone- so can loose silica gel. You can put rice in small fine mesh bags so it can’t move, but still allows air flow. And don’t pour rice on your filament 
- problem solved.
Rice can introduce dust and starch:
To be clear- Dust is rice dust, rice is a starch- the dust is a starch.
Solution I simply put the rice in some fine flour sifters and agitate it. You can remove the dust and again- the filament is NOT coming in contact with the rice like immersing a phone in it does.
A study found that after 48 hours in rice, only 13% of the water had come out of the phone.
I saw these tests. The humidity content of rice out of a bag varies. They did NOT dry the rice first, so how accurate are those numbers when there is no control?
Corrosion comment is not applicable unless you submerge your AMS in water. 
Apple warns against using rice- that’s because you immerse the phone in rice to remove the water. Again not applicable for what we’re talking about.
To dry rice before first use, or at any time to recharge it, spread it on a cookie sheet or flat surface and put it in an oven or dehydrator at around 120 degrees for 8+ hours. Similar to how you dry out silica gel, but at a lower temperature. You can go longer, but so you know, dry rice holds a moisture content of 12% or less immediately after drying.
Keep in mind, drying times will vary based on your relative humidity and you could try higher temperatures. The 120 degrees came from an article on drying rice for long term storage to be used as a food.