Limit thread too 2 people only?

[DAMINK]

I am hoping to get created a mod for my forum. Or even help to make it myself.
What i am hoping for is as below.

1) A particular forum that can not be accessed but can be viewed by all. (No biggy ofcourse.)
2) A request form for people to challenge other people and accept challenge.
3) Then once accepted by staff they have access to 1 specific thread in that forum.
4) There would be a time limit and perhaps even post limit options for this.
5) Perhaps a public or member based poll hooked in to decide winner.
5) To hook into an awards mod like xperience to ultimately award the winner.
6) Once finished they are back to not allowed to post and thead locked.

Sorry for the way i layed it out. Hell i dont even expect anyone to help but hope.
The reason i put it this way is because i have a bad habbit of not being clear and it often upsets people.

The reason i want all this is actually simple.
A part of my forum is a flaming area.
I want to control a particular area so that only 2 can enter and post after a call out has occurred then ultimately an award is awarded once the winner has been established.
I have done this manually for years now and i am getting sore fingers

Now i know there is already a mod out that can limit time and posts on a thead.
https://vborg.vbsupport.ru/showthread.php?t=248942
Thats it there. So i guess thats half my battle right there.
Still its more of a wish than an expectation. Still i thought i would put it out there.

Hope to get some replies and not just get lost in archives!

Cheers DAMINK