Well, your in luck as most of us fat arsed ol' grey beards down under, average 100kg in battle dress.
Many are the bikes that come from the factory with front springs to suit an 85kg rider, and a rear spring to support 75kg or less, go figure.
You will need a rear spring in the 10.5 to 11kg range, stock is 9.6kg.
I have a Matris R, but Penske can build you one as well as Walter Preisig from YSS/Hyperpro in South Australia. I only suggest this as a way of cheap freight in case you need follow up service considering your remote location.[You must be registered and logged in to see this link.]
I would respectfully suggest you do not need lighter front springs;
1. I have never heard of stock springs being too heavy for a 98kg rider.
2. Static (stationary) is one situation, forward weight transfer when braking is another.
3. With a stiffer rear spring and better damping, on any given bump the front will appear to travel a lot further than previous, and it will feel softer.
4. My Bellagio is now close to 200kg wet (300 incl my fat arse), has stiffer than stock front springs (9.5kg from memory) yet feels very compliant.
I know the shit roads you ride on, I ride to Biloela once a year.
If you want to deal face to face with a great suspension tech in Brisbane, contact Scotty Heyes at Edge Competition on 0431 109 675