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I wouldn't use Arduino its very slow (unless some new powerful version has been recently released) Use a teensy(dev board) or one of the very powerful nxp arm micro controllers for far more powerful / capable micro controllers (but not the silly 400mhz speed ones no one needs that much power to drive a basic led display). Or even a raspberry pi with the rgb rpi lib (all led driver work has been done for you) You get the wifi for free with the raspberry pi route 
Yeah the RGB DMD board is designed to have a teensy plugged into it (if its the one i think your referring to)
from all the features you mentioned sounds like you would need your own custom firmware to implement them? pin2dmd firmware is not public and you would be stuck with its default features. Unless you have a computer sat in the middle.
Buy directly from alibaba/aliexpress not from adafruit unless you want to pay x10 the price. Its very cheap directly from china. You just gotta wait. Usually come within 4 weeks but can have shipped quicker if your desperate for em.
teensy handles all the uart interrupts for you and will call a function onced its received a uart packet. There are some great example on sending uart data on there main website.
Cheap and fast dont go together when it comes to shipping. If you cant wait you will have to pay more!! 
Also order few more then you neef they can often come faulty.
just power it all from one 5v rail via your psu, usb should just be for data you don't wanna power much from it.
Converting just a normal image / video to 128x32 res usually looks pretty crap without a lot if touch ups. Almost all pinball dmd artwork is handrawn or created using special tools for low res displays. If you want good looking animations probably exporting from pinMame is your best bet.
thats flux from a repair, most likley repaired boards. Which seller did you use? Iv ordered thousands of these things never seen a completely dead one Thats very unlucky 
Try this company as have bought from in past without issue.
Led Display Solution | Module | Control System
https://s.click.aliexpress.com/e/cdgt99Zr
Quoted from legtod2:I got burned buying products from AliExpress.com. I purchased two P2 panels with expectations there may be problems with one but the other may work. Unfortunately both were defective.
I attempted to use the web site to disbute the issue. The net result was no refund or offer of technical support of any kind.
From a trouble shooting perspective I utilized input from two different sites attempting to use a teensy 3.5 and arduino mega to get the panels to work. I could not get them to work.
Going forward my humble opinion is to avoid this vendor. Somewhere along the way you will be burned.
There is nothing wrong with AliExpress it self there are some great sellers on there sounds like you just found a bad egg
Before saying the panels are bad you really need to make sure your setup is good! ie have a confirmed working board running good on it first. Otherwise it might not be the boards that are bad
Iv tired quite a few and had very good success and eventually settled on one who i order thousands of the thing from. These panels are only made in china you literally cant buy them any where else (adafruit does not count they just buy from china and then x10 the price!!!)
Keep trying you will find a good seller
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