Somebody mentioned high Pendolino seatbacks.
Have you tried the refurbished FGW HSTs or EMT 158s?
View = nil, except for the blank plastic seat back 12 inches in front of you.
Yes the seats are high, but the legroom is exxceptional and the seats themselves are wider than the Pendo/voyager ones. Not to mention better padding and bigger drop down tables. High seats don't bother me personally, you can still see fine out of the window just not down the train. It's quite nice being tucked away behind those seats on FGW.