Versatile Channeler level drop bypass

[Someone_____]

So the Versatile channeler states that "If you normally channel negative energy, you may choose to channel positive energy as if your effective cleric level were 2 levels lower than normal."
is there any way to bypass said level drop

I'm wondering because the party im joining is in need of both a channel (heal) guy and an AoE attacker i was thinking about using the undead sub-domain but it also doesn't last a long time so i couldn't run negative channeling and heal, is there some archetype or other class or something that would let me do both negative and positive channel?

also, I was planning on going holy vindicator for empowered and later maximized heals and for the nice ac boost from vindicator shield

Edit: Or whould the best bet to compensate be to use a Phylactery of negative or positive channeling?

[Belafon]

There's no feat equivalent of Accomplished Sneak Attacker to "make up" the lost die for channeling.

If you are just starting a character, here is the class you are looking for. If you have a neutral deity and are of neutral alignment, you can be an Envoy of Balance. At second level you can take the Spiritual Equilibrium endowment, and that would let you channel at your full character level. At 4th level you can take the twinned channeling endowment. That lets you simultaneously channel to heal (at full strength) and to harm (at level -2), all for just one use of channel energy.