I'm trying to connect a drain hose from my dehumidifier to the drain pipe under the sink. Here's a photo and a drawing (with measurements) of what it looks like currently under the sink.





I'm a total beginner at plumbing, so appreciate any help. I've searched this forum, and others, looking for someone doing something similar. The closest I can find is installing a dishwasher, where people add a tailpiece with a branch in it to connect the dishwasher drain hose. So that's what I'm trying to do, but I have a couple of questions.

Q1. Can I add an extra tailpiece with a branch in it, between A & B? Obviously I would need to add a corresponding length between B & C, making the P Trap lower. I have the clearance, but does this cause a problem with drainage?

Q2. If I can't do that, can I replace the existing tailpiece with one that has both a branch to connect the dehumidifier hose and a pop-up linkage? Will that involve replacing the existing sink drain?

Any and all advice appreciated. Thanks.

Alex