There might be a fourth option/caculation here, sign up with the provider with the cheapest EV rate on their 24hr planC - what the 24hr rate will cost you over 3 months + what the EV rate will cost for 9 month + the break fee
Go with whichever works out cheapest.
and then change plans when you're up and running in Janaury
AFAIK there is no break fee for changing plans with a provider, it is only charged if you change provider before your contract is up
The only worry with this option is will their EV rate still be the cheapest in January??