Really depends what you class as a tier 2 org.
If you mean a start up one e.g. Disguised. Realistically if your goal is partnership your only option is ascension.
If you have some money to throw around then your best option is partnership/title sponsorship with an org that's already in ascension e.g. Giant X or if you have fuck you money to throw around than buy out a partnered team entirely. e.g. if EG went into proper broke mode and you bought all of EG you probably get to keep their partnership spot.
At the end of the day, if you want to get in their needs to be a spot available and unless another org breaks contract in some way. Their probably won't be any spots available any time soon
Edit: T2 orgs being proactive would inevitably result in a huge economic loss for any team involved without the chance of returns, so why risk it. Go put those resources into new emerging titles or hold onto it and reinvest in your current games that you have a foothold in.