Starter Fuji questions

Getting back into photos, I was a long time Nikon DX shooter. Then I switched to Micro 4/3 for some years. For the past couple years I quit photography so it's all sold off.

I was tempted by full frame a few times (D600) and even bought a Sony a7C due to the tiny size but at the end of  the day, I didn't like using it and the lenses tend to be too large anyway. So I'm firmly an APS-C person, although M43 treated me well.

My main use is travel, I travel a lot for work to interesting cities and I'm a motorcyclist. So a smaller, rugged kit with a good 24-120 or 28-200 equiv plus good small primes suits me well. Not too expensive in case it's stolen off my bike, maybe $1500 max value to carry. Compact landscape lenses as well, 2.8 is not usually important for me in terms of zooms. I like a good fast 24, 35, and 50. Fuji seems to have me covered. I love the film simulations too. Questions...

1. I have heard it's hard to process Fuji with Lightroom, true? I don't like Adobe particularly but I know it well so I have the muscle memory. I'm not real keen on their subscription program either so I'm willing to learn a new platform. What do we use for Fuji processing?

2. X-T3 is now on sale for $899 at my local shop, is that a good start? I love love IBIS but at that price I'm very tempted. Should I buy a used X-T4 or X-S10 for the IBIS? Or just get a beater X-T2 and wait for the X-T5? Very confusing choices here.

3. Any issues with the Sigma 16, 30, 56 trio on Fuji bodies? I would probably start with the 16 and a 18-135 or 16-80 unless somebody tells me a better combination. Tamron 18-300, or 17-70 2.8 I know nothing about but they seem like a good compromise.

Thank you in advance for any thoughts.