I especially like the idea of on-site upgrades, if that means user installed like the USB card and soon to ship new network card.The 3 options posted earlier today (quoted above) are what we will offer.
We’re also investigating on site upgrade options.
I was musing about this the other day and envisioned something like a generic (inexpensive!) BPS enclosure for behind the equipment rack. When I considered how to join the two one of the thoughts I had to minimize the need to do major surgery on the existing Extreme enclosure was to use the existing IEC inlet for DC power to the Extreme. And if the DC receptacle on the BPS enclosure for the Extreme was the same as the wall receptacle of the owner's country, then an existing power cord could still be used.
Inside the Extreme the rectifier bridge, transformer and choke would be removed. Not sure that the existing capacitors need be pulled since they could certainly serve as a reserve for fast, transient power demands.
Anyway, just thinking inside the box.
Steve Z