Regarding the tyre size, the one you mentioned 80/100-18 would fit your bike. may be its around 3 mm high but that wont be an issue.
If you desperately want tubeless tyre, then change the wheel to tubeless one and then fit the TL trye.
Changing your bike is not necessary unless you are not happy with the bike performance for your kind of travel. I would say change your wheel and tyre to tubeless one..







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