Hi you can use pac 3 to give your alt walk a proper animation and it's not too difficult, there are 2 methods,
1:
Set an event for speed, it may be difficult to find the alt walk speed
Then set an animation for walking such as walk_all
Then invert the event, try walking

2: this one takes more time but it will sink the sound of walking with the animation better than the first method
Set a model then find the playermodel, then bone merge the model
Once you have done that select entity and hide entity, then it should show the walk animation for the model you were using, hope this helps