Nice idea. I have yet to notice a need for new sub-frame bushings on my '01 with 190k+ miles. But I'll definitely keep this in mind.
I won't be worried about any difficulty in re-doing the job at 400k miles.
BTW, I used a similar item for a similar repair. On that same page is listed 3M Windo Weld
https://www.amazon.com/dp/B000FW61EW..._t2_B001G0R1N2
It seems to me that at least one of the Ms in 3M is for magic, so I'd pay the higher price and use that stuff. I've always been amazed at most 3M products.
I used that, following tips on the Porsche rennlist.com Cayenne site to fix a failing bushing in the engine torque arm (common problem on those cars). Worked perfectly. So well that I had been hoping to come across another need for the remaining 90% of the 10-oz tube before it solidifies.