I had a Tobin (now New Image) seat that had a smaller rider area and a larger passenger area with a slightly raised passenger front portion that probably would havbe fit your purpose. I sold it after I acquired a C-14 lo gel seat which, while somewhat harder in front, has a more generous rider area.
'07 CPB Blue; ZGST windscreen with MRA X-screen adjustable spoiler, tube bar adaptor, PC III, ATRE,BMC air filter, modified stock seat with 2nd Look cover,Scorpion Flame Ti slip-ons, Galfer rotors front and rear, braided-stainless lines, C-F 10R front fender, C-F hugger, C-F inner fairing panels, painted foreman's fins with faux C-F inlay, polished rim lips wired for heated gear and accessories, Givi V35 side bags and E41 topcase with SW-Motech qd mounts