After Biotech was released I was happy to hear it would include an option to change your style basically giving you freedom to craft and build everything from all of the styles in the game vanilla and modded alike.
How to Unlock
You can use dev mode to change your ideology style whenever you want, turn on dev mode and click the edit ideology button on the top of the ideology tab, change your style into whatever you want to build and you can change it back after if you want, or you can just add a bunch of styles to it.
Modwise, the Alpha Memes mod has an option to change things to any of the styles in your ideology so you can use secondary styles instead of certain things always being your primary. So if you are techist primary and spike secondary, you can use the option to change a piece of techist gear/furniture to spike instantly and for free.