Help with proxy on a client

Im trying to separate 2 accounts and people on here told me a socks5 proxy on one would make jagex think there are different accounts with different owners. So i downloaded proxifier and and bought a proxy and while it all worked it changed my ip for everything. I tried adding rules and stuff to make it only work for a runelite client but i couldn't get it to work out. I feel like this is probably a simple thing to do and im just not very experienced with it.

Could anyone give me a quick guide on what i need to make a runelite client run through a proxy. I would like to be able to have 1 runelite client on my home ip while having another on the proxy. Possible?

I do not need to bot on this account so i only want it separated from main as i do intent to sell gold off of it. I also would want to play it on runelite because i enjoy the features it has.