Really sorry to hear this. As to whether you have any chance of success - it will be limited. It is an EV ‘recharging’ bay NOT an EV parking bay. In mitigation it would be interesting to see whether the other car who ICE’d you was similarly ticketed. Do you know? There is a possibility you could suggest you were waiting there (‘queuing’, in effect) to access the 3Kw charge post - you’ve nothing to lose. I have to say, Glasgow also have a number of on-street posts that offer free parking - whilst you are CONNECTED to it.
Charging is a misnomer, as you could be fully charged and the charger ceases to draw power, but that is allowable. However I cannot use it for the Twizy as these are 7Kw only. I’m looking forward to finally using them in a few weeks. The plus side - is that (on the Glasgow posts) non EV’s are ticketed, as are Blue Badge holders who are up in arms about the fact they are not being allowed to ICE these locations, but they have refused to accept this as an excuse, which is why I feel your appeal will be rejected - all the boxes must be ticked. I agree the location of the posts leaves much to be desired, but that is not a consideration for the parking adjudicator. One thing though, in this situation I would have rolled forward to the front of the bay - would your coiled lead not have made the stretch if you were at the front? By parking nose-in you you’ll not have snagged the car in front so would not have to have baby-sat the connection.
Lastly, I always carried a 4m extension to provide a bit of length when required - and if you had that, you would have been fully compliant. None of those solutions will help your repudiation of the fine - but it is a steep learning curve!