Slot and use plugin

Server version 1.12.2

Not sure if possiable but I’m creating this because I know their are smarter people out there that may be able to find a way, I do not know what packet / method can be used to force a player to right click though I have seen player forcefully make players open books and stuff, but I do know you can forcefully make them switch slots. With the code “sethelditem” or something around there. Anyways the plugin I want will basically do this:
On ({configurable key} press - if not possible for every key on the keyboard then atleast LEFT SHIFT)
So for example
Left shift
Switches to slot 1
Right click
Switches to slot 2
Right click
Switches to slot 3
Right click
Switches to slot 4
Right click
Switches to slot 5
Right click
Switches to slot 6
Right click

There would be commands so players can switch whatever slots they would like to use so example:
Slot 1-7
Slot 3-9
Slot 9-4

Basically in any way they want.

So maybe you would do something like
/switchslots 1,2,3,4,5,6
/switchslots 9.8,7,6,5,4
/switchslots 1,2,3,4,5,6,1,2,3,4,5,6 (so they are able to set how many times it will repeat basically, though maybe put a character limit of 18 as repeating 3 times will be more then enough and to prevent lag)

ETC

They can also choose how fast or slow the right click after a slot switch can be so basically:

/switchspeed (1-5 | if no hotbar slot is specified this will be for all slots they have set)
{1 being fastest 5 being slowest}

they can also choose which slots will be fast / slow so another example:

/Switchspeed hotbarslot1 (1)
/switchspeed hotbarslot2 (3)
Etc.

Then for the key pressed to carry out the slot switching in our example I said LEFT shift, if you are able to make it any key or just more keys then just left shift the plugin would then need a command for players to change the key so example:

/switchkey E
/switchkey F
/switchkey MouseButton1 (side mouse buttons)

Etc.

Also make add a GUI with all these things in it
/switchGUI

That’s about it, I would be very happy if someone could make this for me.

Not sure how hard it would be but I would be grateful for this plugin

I am also not sure if this would cause a lot of lag with a lot of players doing this at the same time, so if a mod I would distribute to the players would be a better choice please be sure to let me know. And if by chance you are a mod maker and you can make that mod for me with the same features listed above (though obviously a mod has a lot more to work with and I would ask for changes, like a GUI, sliders etc) then I would also be grateful and would want a version for 1.12 and 1.8. Thank you.

 

That’s why I said maybe something like left shift is possible, atleast I know the drop key is possible (from crackshot) so their May be more

 

Yes, So left shift is enough for me, I was just saying if there were any other keys they could add that would be great.

for any who attempts this, https://wiki.vg/Protocol may help, Ctrl + f and search "right click"

EDIT by Moderator: merged posts, please use the edit button instead of double posting.