I believe this Adventurers League webpage on the WotC D&D site describes the current details, ignore the Eberron AL Guides for now. The AL FAQ v8.2 has list of currently available magic items, on page 8, and pages 3 - 4 of the AL Players Guide v8.2 has the rewards and treasures costs. ALPG v8.2 says the costs of items is related to the table they are found on in the DMG.

My local AL Guide has suggested to limit the treasure for these two characters to the following:

At lvl 20, for a high magic campaign, you get 20,000 GP, 2 Uncommon Magic Items, 2 Rare Magic Items, and 2 Very Rare Magic Items, as well as starting equipment.

They said that they think those options seem a little more balanced than AL, for treasure.

Other than that, would you be amenable to a revised Character build options?

20th Level, PHB+1 for everything except race, any non-flying race from hardcover sources, no flight options, gear as written at the begining of this post, and the duel format being first strike, half health, and full health format?

EEPC is an option, and the magic item choice is from DMG, Zanathars, or Eberron.

Not sure on the arena looks, maybe @Otter could suggest one, or know someone who could source one that's impartial?

Cheers @Otter, I've just now downloaded that one. Who would we see about rulings for the arena? Such as traps and similar? Or should either @Acetwinelf or I tag someone? Or forego such things, which would, to me, make things interesting?

I am not against the idea of the arena having traps and other things in it (haha you thought that was a rock, little did you know it was a roper!) however im also very lazy so if you @rjbprime will recruit someone to do that then im all fine for it happening.

I have a bit more work to go on my character and it will take a little time to finish it, school hasnt been giving me as much free time as I would wish. I will probably have it done in a couple days.