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 ...
While the standard-configuration models of Apple’s iMac offer impressive performance, if you choose a couple of build-to-order (BTO) options, you can have a 27-inch iMac with a 3.4GHz Core i7 ...