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Glyphosate and a wildflower meadow maybe not the happiest bedfellows, should totally kill the tree though. Also burning out a wet stump will probably prove harder work than the above illustration suggests.
Stump grinder is the pricey option but will get them out.
Tonts-
The plugs are intended to not impact anything other than the tree, according to the tree surgeon. And to his word, the grass around mine is fine.
And @ColinTheBald, true, but it weren't me doing it so didn't have to worry about procurement.
I still have an unopened bottle of glyphosate in the shed that I panic bought when I first discovered JKW at the old flat. Never used it and got the proper folks in instead. Who sprayed glyphosate, which suitably knocked back the JKW, along with a 1' perimeter of grass. Scary how effective it was.
stevo_com
Or drill holes and insert eco-plugs. Which are essentially glyphosate suppositories. That's what the arborist who cut down some sycamores at mine did.
https://www.green-tech.co.uk/weed-killer-and-pesticides/total-weed-control/ecoplug-max-tree-stump-killer