I would say so...
However it will properly help with the other parts of the trial..
Can the cleric even use touch of glory on himself/herself? It isn't so clear from the description: "You can cause your hand to shimmer with divine radiance, allowing you to touch a creature as a standard action and give it a bonus equal to your cleric level on a single Charisma-based skill check or Charisma ability check. This ability lasts for 1 hour or until the creature touched elects to apply the bonus to a roll." I had a similar question about whether a cleric could use "bit of luck" on herself ("You can touch a willing creature").
As to your question, I definitely think it would be improper at trial, although since it lasts for an hour it could be done pretrial without any problem. In an analogous situation I allowed an oracle character to use natural divination to get a +10 check once per day of trial, of course there it is clear that it is the oracle who gets the bonus. (Natural Divination (Ex): You can read the entrails of a freshly killed animal or humanoid to gain an insight bonus equal to your Charisma modifier on one saving throw. Alternatively, by observing and interpreting the flights of birds, you may apply a +10 competence bonus on any one skill check. Finally, by charting marks in dirt or stone, or observing the behavior of sand when thrown into the wind, you gain a +4 insight bonus on one initiative check. These bonuses must be used during the next 24 hours and you must declare you are using the bonus before the check or save is made. Making a natural divination takes 10 minutes.)
The rule of thumb is that a Paladin can use Lay on Hands on him or herself. So generally, yes, one's own character counts as a willing creature. See also - casting spells on yourself when they have a range of 'touch' instead of just 'personal'
I'd say it would be allowed so long as it wasn't cast during the trial. Of course, it isn't likely that the player side of the case would be presented within an hour of the door being sealed. If I recall correctly, the trials start with prosecution's part of things, which likely takes over an hour.