I would say it’s a matter of research and planning.
I left Uk with part worn tubeless tyres but wanted to use them up. I changed my rear in the US but knew my front would last until Bogota, where there is a good choice, in fact a much better choice of tubeless than tubed (my wife has tubed).
This combo should last for the rest of the trip but if I was going longer I would do the research and if I had to change my tyres when they were half worn then so be it.
It’s also possible to have tyres shipped to a workshop in advance or carry one with you, although that wouldn’t be my choice.
PS depends on the tyre size - met a guy travelling from Vancouver to Chile on a CRF 300 Rally and he’s had trouble finding 50/50 tyres anywhere - he’s now in South America and has no chance.
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