Your fork lacks many of the customary mounting braze-ons that a traditional "touring" bike would use to mount a lowrider rack. For serious long-haul touring, a new fork is the best option.

Lots of good bikepacking gear out there now.
CONS: Harder to access your stuff, and the weight is higher up.
PROS: lighter, cheaper, works with your existing bike.

Something like this is a good solution for you: EXP Series Anything Cradle plus Dry Bag and Front Pouch | Salsa Cycles