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Bars; On-one midge.
Shifter; fettled front derailleur clamp
Fork eyelets; ~£30
Tyres; I haven't put anything below 2.15" on because #monsteur . To be honest ... I find any MTB with good clearances just looks daft with anything under 2" of rubber. Also, with the right tyre the difference between 1.5 and 2" (pending pressure) won't feel much slower but the ride will be improved. Usually this bike has 2.15" Maxxis DTH which feel both good on road but also pretty positive on looser surfacing (dust / grit / gravel).
Mucky