It might be possible if you can keep the used space extremely limited, make use of alternative goods production (like library set, mermaids paradise, trader I II and III from the MA ect.
Then you could have insane scores I think in 6 tournaments with the following rules.
It must be in the orc chapter (to unlock more than 222 provincies and at the same time don't be bothered with orcs mana ect in the tournament which saves space)
Get not more production than you need and keep space to an absolute minimum. do not build wasted space like MA or barracks, and maybe you might get away without a trader as well. (tho this might interfere with aquiring the correct buildings)
Do not give neighourly help and get rid of your bonus relics by leveling, then destroy rebuild ect of wonders.
Goals 0 relic bonus (you do not need it for alternative production buildings)
Absolute minimum of expansions, and those you do get have to be premium (go spire?)
This should get your costs in the tournament to near chapter 1 levels
When we look at a chapter 8 town, with only 21 expansions in total (6 base +15 premium we see these costs
View attachment 4846
These are very reasonable numbers that might actualy be possible to aquire in decent numbers.
And those coins / supply needs in a pinch are also very easy to aquire with a little bit of questing in numbers much greater then required so limited questing only.
Off course this is looking up the edges of possibilities but yes it surely is possible.
I also wonder with these numbers how much more expansions you can get away with before it no longer has a net gain.
I just grabbed a value I liked, but a much larger city might be possible as long as you keep that relic bonus at 0.
You would need to run some simulations to figure that out.
The problem I see with the relic bonus is that you earn so many relics playing the tournament that it would only be theoretically possible.