If it's feasible, you can boot your 21" iMac into target disk mode, cable it up to your 27" iMac..... The inability to run a cable to the 27" is the reason I kept the 21". When the 27" came out, Apple dropped the TRS audio cable input.
ryck
"What Were Once Vices Are Now Habits" The Doobie Brothers
iMac (Retina 5K, 27", 2020), 3.8 GHz 8 Core Intel Core i7, 8GB RAM, 2667 MHz DDR4
OS Sonoma 14.4.1
Canon Pixma TR 8520 Printer
Epson Perfection V500 Photo Scanner c/w VueScan software
TM on 1TB LaCie USB-C
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