Is the classic button too unsafe?

Use a keycard reader and place it in a wall to secure a door or redstone mechanism.

Security Levels

In Arvan there are 5 different levels of security key to discover and each keycard reader will give you a precise access. You cannot create these by crafting thems... but you will be able to find them in ultra rare chests or in a quest... However unlocking some features, as for example the Slimefun Mod in game, you will also be able to crafting a computer or pannel that create for you a totally private reader, that you can use as you wish to secure some access or some redstone mechanism.

Custom Reader Security

Howewer you will not be able to craft the 5 different levels keys... because them will let you explore an ultra rare and unique military laboratory dungeon where you will find the Special Gates