Touratech also has some lowering options.
I had the same issue on an F850 but after some time got used to it. There are good riding tips on youtube for short riders. Additional to the spring you can also think of a rear tire of a lower profile, you can get 1.5 cm lower from that. At the front you can get some lowering from the triple clamp too.
If you choose to lower have in mind the sidestand will need to be shortened or replaced, same as center stand.