See post #83 in my DS80 tread,
I made up a new 15mm longer linkage arm and fitted that, it gave me an extra 2" height in the rear.
With the front forks have you fitted a 3/4" spacer to raise them and add a bit more preload ?
It's easy enough to do, fork's need to be pulled apart and fit the spacer between the top of the spring and the top cap.
It only raises it about 1" but the extra load on the spring's firm's them up a bit.
To level out the feel of the bike, i added another pair of bar clamps under the old ones to lift the bars 3/4"
You could probably fit some late 70's - early 80"s RM80 forks and front brake cable to the DS, but might need the tripples off the RM too?