[Adventure] Chaos game mode not chaotic enough

I'm probably not the only one that loves how in Shandalar's hardest difficulty you start with a 5-color pile of mostly random cards, only lightly color-weighted, then have to slowly dig yourself out of that hole ?
Adventure/Forge is IMHO a bit too friendly for now in that regard : even on insane difficulty and Pile mode you start with a fairly neat pile of main color + splashes of 2 allied colors :
(And which, even on insane difficulty, you can make even more consistent by slimming down from the starting 60, to 40 cards. In fact, going directly mono-colour seems to be a pretty viable plan !)
And Chaos mode is disappointing in that regard too because it "just" makes you (and enemies ??) start with a random, but neatly constructed deck.
So, I'm thinking that the easiest way to replicate the aforementioned Shandalar-chaos experience is to have a 6th color option (and mode forced) where you just get a completely random pile of cards (maybe not even keeping the rarities, creature/land/spell ratios ?). The only other modification this might need is to go back to Shandalar's way to replace under the minimum deck limit cards with random basic lands and not the current Wastes.
In fact this seems simple enough that I might be able to hack this together myself, regardless of the programming language used, would you be so kind to point me to the place(s) in the code governing these features ?
Adventure/Forge is IMHO a bit too friendly for now in that regard : even on insane difficulty and Pile mode you start with a fairly neat pile of main color + splashes of 2 allied colors :
(And which, even on insane difficulty, you can make even more consistent by slimming down from the starting 60, to 40 cards. In fact, going directly mono-colour seems to be a pretty viable plan !)
And Chaos mode is disappointing in that regard too because it "just" makes you (and enemies ??) start with a random, but neatly constructed deck.
So, I'm thinking that the easiest way to replicate the aforementioned Shandalar-chaos experience is to have a 6th color option (and mode forced) where you just get a completely random pile of cards (maybe not even keeping the rarities, creature/land/spell ratios ?). The only other modification this might need is to go back to Shandalar's way to replace under the minimum deck limit cards with random basic lands and not the current Wastes.
In fact this seems simple enough that I might be able to hack this together myself, regardless of the programming language used, would you be so kind to point me to the place(s) in the code governing these features ?