Working with conditions in Update / FixedUpdate?

Dear beloved community and experts.
I have been attempting to further optimize my controls code so that I have one script for all input that only calls and recognizes the Inputs if certain bools / if-conditions are true.
It is crucial for the project as I have multiple playable characters, like in "Thomas was alone". So I check which of the player characters is currently active, for multiple reasons.

I wrapped an if-condition around the Inputs in the Update of that central controls script.
Now, the new input system, from what I know so far, links any Input to its method in Awake.
However, is it still possible to get the new system to run and detect stuff in Update as I show you in my code example below?
Or do I need to redo that outer if-condition and have to check it in the individual methods now?

Code (CSharp):

1.  
2. void Update () {
3.  
4. // This if-check is the crucial part.
5.         if (player.activeSelection && player.canMove)
6.         {      
7.             // Move
8.             if ((Input.GetAxisRaw("Horizontal") < -0.1f
9.             || Input.GetAxisRaw("Horizontal") > 0.1f)
10.             {
11.                     player.Move();
12.             }
13.             else
14.             {
15.                 player.MoveStop();
16.                 player.isMoving = false;
17.             }
18.  
19.             // Run
20.             if (Input.GetButton("Run"))
21.                 player.anim.SetBool("runButton", true);
22.             else
23.                 player.anim.SetBool("runButton", false);
24.  
25.  
26.             // HOLD RUN BUTTON & MOVE LEFT / RIGHT
27.             if (Input.GetButton("Run") && (Input.GetAxisRaw("Horizontal") != 0))
28.             {
29.                 player.Sneak();
30.             }
31.             else
32.             {
33.                 player.maxSpeed = player.moveSpeed;
34.                 player.isSneaking = false;
35.             }
36.  
37.             // DROP ITEM
38.             if (inventory.hasInventoryItem && Input.GetButtonDown("Use"))
39.             {
40.                 player.DropItem();
41.             }
42.  
43.             // DOUBLE JUMP
44.             if (Input.GetButtonDown("Jump") && player.isDoubleJumpReady)
45.                 player.DoubleJump();
46.  
47.             // Jump
48.             if (player.canJump)
49.             {
50.                 if (Input.GetButtonDown("Jump") && player.isGrounded)
51.                 {
52.                     player.Jump();
53.                 }
54.             }
55.  
56.             // GRAB ITEM
57.             if (player.rayEyes.collider != null && Input.GetButtonDown("Use"))
58.                 player.GrabItem();
59.  
60.             // FIRE WEAPON
61.             if (Input.GetButtonDown("Fire"))
62.             {
63.                 if (inventory.hasInventoryItem)
64.                 {
65.                     if (inventory.InventoryItem.CompareTag("weapon"))
66.                     {
67.                         playerRat.FireGun();
68.                     }
69.                 }
70.                 else
71.                 {
72.                     if (player.canPunch)
73.                     {
74.                         player.DoPunch();
75.                     }
76.                 }
77.             }
78.          }
79.     }

Help is much appreciated.