Looks like you are sorted but to add from experience
I flew easyjet last month, Gatwick to Geneva and Nice back to Gatwick.
Co2 fine in carry on
Lighter fine in carry on (in a liquid bag).
I also got het up about spare batteries, which went in my carry on fine
Emptied/dried meths stove was also fine with bike in cardboard box.
Flying Easy Jet with gas cannister/CO2/meths in hold bag
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