I have a 2015 Kona Sutra

Crankarms: Shimano Deore
Chainrings: 28/36/48t
B/B: Shimano Deore
Chain: KMC HG53
Freewheel Shimano Alivio 11-32t 9spd
F/D: SRAM X5
R/D: Shimano Deore SGS
Shifters: to F/D Shimano BarCon(friction shifter), to R/D Shimano BarCon(indexed shifter)

I'm planning a tour in hilly terrain, and I have been advised I need lower gearing maybe 22t, but I don't really want to lose any from the top end of my gears, as I also commute with this bike and don't want to swap components out every time I go touring. can anyone offer advice if I can swap to a 24t or 22t chain ring, and swap the cassette to a 11-34. and maybe swap the hire chain ring from a 48 to a 50 or a 52, but I'm less concerned about the higher gear.