How about instead of all that just remove the KDR stat?
You'd also have to remove the kill counter that pops up when you get killed, you know the thing the tryhards love to quote. That should be affected by suicides too.
Killed by police would be the next issue though. I often get killed by police if I'm having a fight with someone, mainly because I don't use snacks or armour (why waste it on some little tryhard nugget?) so if I'm hit a few times by the other player and police are around, it's more often them who get the kill.
But then, you have more technical problems to look at when you have a number of players shooting at you - who would the suicide affect?
To be honest, that kill counter is the stupidest thing in the game. Remove it. Put it back in for one on one DMs. Have one on one DMs make both players ghosted to other players and police.
But hey, it's the easiest thing in the world to find fault with something. I doubt anything will change. Just stick to walking away however you can if you don't want the fight, if you do want it, fight clean and have some self respect.