scripting - proper slot switcher

This is a script to switch weapon slots that doesn't break where most such scripts do.
Taking feedback / requests for entertainment.

The problem:
-> Executing a command string every time you switch to a specific weapon slot.
- Normally pressing Q ( selecting last slot ) will bypass your bind.
- While this is trivial for something like "slot3; voicemenu 1 1; exec say_lenny"
- It is catastrophically obnoxious if you're trying to hide a viewmodel of a specific weapon or +reload only your rocket launcher.
-> So how do you track the last active slot without variables?

The solution:
Have a separate alias per condition ( switching from slots 1,2,3 to slots 1,2,3 )
Have each switch update which slot you'd be switching from for each key / base-alias ( 1,2,3,Q / s1,s2,s3,sL )

The price:
Running 3 alias commands on every slot switch

Script

-> You have to edit this script - Add commands to ( s[1,2,3]b ) aliases.
-> Keys bound by this script ( 1,2,3,Q )

// last slot
alias sL   s12
bind  q    sL

// slot1
bind  1    s1
alias s1   s12
alias s12 "alias sL s21; alias s2 s21; alias s3 s31; slot1; s1b"
alias s13 "alias sL s31; alias s2 s21; alias s3 s31; slot1; s1b"
alias s1b ""

// slot2
bind  2    s2
alias s2   s21
alias s21 "alias sL s12; alias s1 s12; alias s3 s32; slot2; s2b"
alias s23 "alias sL s32; alias s1 s12; alias s3 s32; slot2; s2b"
alias s2b ""

// slot3
bind  3    s3
alias s3   s31
alias s31 "alias sL s13; alias s1 s13; alias s2 s23; slot3; s3b"
alias s32 "alias sL s23; alias s1 s13; alias s2 s23; slot3; s3b"
alias s3b ""

miscellaneous commands

  r_drawviewmodel
  tf_use_min_viewmodels
  cl_crosshair_[ file / red / green / blue / scale / alpha / color ]
[ hud_medicautocallers / hud_medicautocallersthreshold ]
  tf_viewmodels_offset_override [ 0 0 0 ]
  viewmodel_fov

more commands at:
https://developer.valvesoftware.com/wiki/List_of_TF2_console_commands_and_variables