Jimson,
If the KL forks don't fit it'd be worth considering late 70's 32/33mm 185 Suz forks, triples & front wheel. IIRC the triples have 25mm stem like F6.
They could do w a longer swingarm & wheelbase too. Again, 185 Suz should fit straight in. Or MT125 Honda at a pinch. I'm in the process of doing it to my bros F7. Some 185 Suz wheels had alloy rims too.
F7 175 top-end should fit straight on too if you want more beans