I could talk in length about the locked tomb first person video game.
It could fits so good, a combination between combat and role playing. AND you’ll be able to listen to the inner monologue which is the most compelling part of tlt. In Gideon you could walk around until you get to Harrow and you could spy and maybe find some doors, you can choose what kind of gameplay you are going for.
In Nona at the end your HP could just go down. And the last scene with Alecto could be from a third person pov.
In Harrow you can eat biscuits with jod and make the soup. And all the parts can still be confusing.
I think that video game adaptation could really fit the style of the books