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MIan K said..
For isolated clumps just wander around with a small chainsaw fitted with the longest cutter bar. ( Fisker L98 loppers from bunnings @ $100 are good for < 50mm stems if you don't want to start up the saw.) Paint the stumps straight away with neat roundup (glyphosate 360). You'll do 3 clumps by the time you hitch up the chain and get back on the tractor. Beware that some of the cut up stems left on the ground may take root. Just pull them out by hand a year later. Lantana can get much thicker and harder to handle than that shown in your photos! Get on to it.
I also have spent a bit of time on lantana. We specialised in areas not suitable for large machinery, too steep, too rocky or mixed in with natives that needed preserving.
Yes, agree, I did try this method too.
Looper is very handy for small clumps.
Chainsaw is even better but very risky. I could cut trees whole day without a problem, but few minutes on the bush and chain is usually off the bar.
Hedge Trimmer from Aldi works well for me most of the time. I will send proper picture presenting problem later on. Usually, clumps are so big and dense that access to the trunk to cut is not possible. Another place, there is not even the clump but continuous wall of lantana bush. Even spraying isn't possible without cutting a path first.
You are also right that for one person walking of the tractor to attach chain is too time to consume.I am thinking to make sort of boom say 3 -5 meters long with a powerful grab. If I attach this to the front of small tractor I could approach clump, hydraulically close that grab on around lantana near the ground and then push with a tractor. Lantana is relatively easy to pull from the ground, so should work.
The matter now is to design this light but powerful grab that could catch lantana around. I imagine that this way I could root lantana clumps completely without leaving tractor, then drive to next one etc.
Cant find proper lightweight grab, so possibly need to make myself. If use electric actuator 12v to close the grab instead hydraulic ram, the design should be even easier. My small Chinese tractor has all hydraulic pump and control, even rams but I think electric could be optimal.
BTW I think that force available with a small tractor will be higher for pushing than pulling. While pushing something tractor tires trying to dig deep into the ground so traction should be much better.
I have been amazed that this tiny tractor pushing against huge tree trunk keep spinning wheels without any sign of overloading. Just keep digging into the ground deeper and deeper.

I may need a miniaturized version of such grapple.