This might be a bit too far out of left field for this thread but have you looked at UK£ preference shares and ex-PIBS? If you don't mind the currency risk.
E.g. Standard Chartered Bank 7.375% pref and 8.25 pref. (STAB and STAC)
Available at a yield of roughly 6.5%. These are perpetual, fixed dividend shares that act like non-dated fixed income.
There are a few similar issues from the likes of Santander Bank, Lloyds, NatWest, Aviva.
The yields are juicy but there are of course risks! DYOR as always....