Weihrauch did, if they did for the export market only.* Along BB Pelletier they couldn't design the 80 out of the 35 on their own they needed help from Dr. Robert Beeman (for just lengthening the piston stroke by 2cm) maybe it'd take two doctores now for 3.5 cm more stroke

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Quite easy to design: Same rifle but 120 mm stroke, tube then about 5.5 cm longer, cocking link pivot about 1.5 cm forward, 3 cm longer piston weighing then about 400g.
Rifle overall length about 121 cm (with 50 cm barrel, not too long) Just need someone to machine it.
*Surely some German "experts" will purchase such a HW120 in cal. 0.177, stroke it down to 5 cm and pretend it then to be the best air rifle ever.