You can already get heated cushions, not sure about pillows though.
Sweet Dreams Electric Heated Cushion/Pillow/Heat Pad for Back Pain & Arthritis - Digital Control with 3 Heat Settings & Auto Safety Switch Off After 90 Minutes - 40 x 30cm (Beige, 40 x 30 x 14cm)
Sweet Dreams Electric Heated Cushion/Pillow/Heat Pad for Back Pain & Arthritis - Digital Control with 3 Heat Settings & Auto Safety Switch Off After 90 Minutes - 40 x 30cm (Beige, 40 x 30 x 14cm): Amazon.co.uk: Health & Personal Care
You can buy something like this here http://embraceglobal.org/
You can already get heated cushions, not sure about pillows though.
tried the ooler system?
Can’t find anything where the actual headboard reclines, but there are loads that let you adjust the base.