SRAM made Dual Drive hybrid IGH/Cassette rear hubs in 8,9 and 10 speeds plus 3sp planetery gear. Sturmey-Archer continues the tradition. That's what I would do if I wanted both a high gear in the 100 teens and a low in the low teens or even high single digits. The Sturmey-Archer 3x8/9/10 is under $100 for the hub without cassette! Laced into a decent 20" rim ... <$200.