There seems to be a lot of conflicting information about recovery pumps, and somewhat of a conundrum, too. I see a workable solution to all of this.
The Appion G5 Twin is not rated for R600. It is not explosion proof. That it may wash oil into the butane is irrelevant. It's not not the right pump because it's not explosion proof. Use at your own peril. The fact that almost every closed system purveyor shows pictures of their product connected to an Appion seems downright irresponsible to me.
The CM-EP (and others) are rated for R600, but they are not oilless, so they wash some oil into the butane during recovery. You won't blow yourself up, but now you've got another problem. Therein lies the conundrum.
Seems to me that a hybrid system is the solution here. Use a CM-EP to rapidly recover your solvent from the extraction into a suitably sized distillation vessel. Passively distill the fouled solvent from the distillation vessel back into your "clean" tank as a separate process. Granted, it's two separate steps, but it gives you fast recovery of your extraction vessel so you can start your vac purge, and solves the fouled butane problem. If you're not trying to go full tilt production all the time, it's a perfectly workable solution. The entire time you're purging, you're also vapor distilling your solvent for your next run.