Idea regarding games when you have 95lp or higher

So everyone has been the poistion where you are 95-99 lp and you have to play a whole game to earn 1-5lp when you usually gain 20+. My idea is that if you were to be 95lp or higher if you win this next game it counts as win for your promos and if you lose then it counts as a normal loss and you lose lp according to you mmr. This is could also not work in certain higher elos if it causes problems or be turned off if you were already in the league like if I was in Gold 3 and I dropped to Gold 4 when I got back to promos it is going to give me a free win. So if that were the case it would be turned off because otherwise winning that game at 98lp-w/e would just promote you immediately.