URL Distribution

I received a request as to the possibility to or distribute traffic for one url to multiple urls (round-robin, least connections, or even just randomly ) but never exceed 50 connections to each one. I am struggling to find the best way to do this, if even feasible. This would not be sending to different pools/server, but to different "forms" on the same server/pool. Any guidance anyone can provide would be greatly appreciated.

Here is an a visual  example of what they are trying to accomplish:

https://forms.dummywebsite.com/form would distribute traffic to the following without without a redirect or end user noticing a url change in their browser.

                                                                    >       https://forms.dummywebsite.com/form1
                                                                    >       https://forms.dummywebsite.com/form2
                                                                    >       https://forms.dummywebsite.com/form3
https://forms.dummywebsite.com/form        >       https://forms.dummywebsite.com/form4
                                                                    >       https://forms.dummywebsite.com/form5
                                                                    >       https://forms.dummywebsite.com/form6

It would be required that each form would never more that 50 connections. I have found a potential irule  candidate pasted below from another post (thanks The_Bhatmann - distribute-load-based-on-uri) that contains a counter that may be able to be adjusted for this, but not sure it really fits the bill. It would need to monitor all the connections to make sure each connection has not exceeded 50 before more traffic is sent to it. All my other google-foo has failed.

when RULE_INIT {
   set counter 0
}
when CLIENT_ACCEPTED {
    if {$::counter <= 7} {
     The first 7 connections go to Server A for URI 1
      pool  member  
      incr $::counter
   } elseif {$::counter <= 10 } {
      The next 3 connections go to server B for URI 2
      pool  member  
      incr $::counter
   } else {
     Reset the counter when 11th connection is reached and go to SERVER A for URI 1
     set $::counter 0
      pool  member  
   }
}  

Thanks for any help/Guidance. Any input is much appreciated