TLDR; yes, it is possible to add an SSD to a 2011 27" iMac without going through too much hoopla. Between everyone having issues finding parts, non-workable guides (due to parts), and general ...
Macworld At a glance Expert's Rating Pros ・4x Thunderbolt 5 ports ・Built-in NVMe SSD ・140W Power Delivery (PD 3.1) ・30W USB-C ...