Welcome to the forum! 
A few things:
XC-108 is 6 characters, Shannon is 7… 
This sounds doable, but keep in mind that HID does make both LF and HF credentials, so you may want to find out more about the system you’re using before jumping in. If you are using an HF HID system you wouldn’t be able to clone it to the NExT
This one should be doable, here’s a related thread:
This one’s less doable unfortunately, off-the-shelf keyboard wedge readers only read the chip’s UID, not the user writable storage. Most people change their password to match their UIDs if they want this functionality, but I do believe you could DIY a reader to spit out the data you want, if you’re a tinkerer
in your case I might choose to do an xSIID and an xMagic, which still wouldn’t help with the password problem, but the HF side of the NExT and the xSIID are quite similar, and you may get more functionality out of having the xMagic. (That’s actually what I plan to do, as I have an xSIID now)