Being new to hacks but a 30+ year rider, I'll add my two cents...
If you have the money to hack the GS, then spend part of it on a used rig to "test drive." If you like the experience, then you should be able to sell the rig and put the money back into the GS build. If you don't like driving a hack, then, again, you sell the rig and you still have the GS to enjoy.
I bought a Kawasaki Concours / Hannigan rig from OgreFL in May and have been retraining my brain for the last few months. I still haven't decided if the Connie will become a permanent part of the stable or if it will fund a hack build on one of our other bikes but the test drive has been an enjoyable one.