Yes similar to that, but I never tried with sand I dont know how effective it is. The roots lifting the soil doesnt count hahaha, the idea is that the roots have a safe space where they will be always be able to breathe no matter how much water you put into the pot and how long it takes to dry. With textile pots the sides absorb humidity facilitating that the pot doesnt stay wet for too long, also the bottom if you have them lifted. With plastic pots the only thing you can do is poke some holes on the bottom if it doesnt have them already and lift them with rocks or clay pebbles or a rack so it has a bit of transpiration and also doesnt sit on water if there's runoff.
In my honest opinion, youre making it very difficult for yourself to water those plants properly because you have to add the exact ammount they will be able to absorb without staying wet for too long in a pot that has 0 transpiration in case there's excess humidity and that ammount will be different depending on the stage of the plant of course so... yeah... very very hard to get it always right

problems are bound to happen eventually.