Worktop mason joint - change male into female?

Hello all

I have a worktop with mason joint thats starting to fail next to a sink.

Looks like it was just superficially sealed with colorfill on the top of the joint.

I'd like to avoid replacing both worktops, so wondered if it is a realistic option to change the right hand female into a male joint.

The photo shows the current scenario (ignore the paint pallet - thats just a watermark from the resizing software).

Ideally I want to just replace the worktop on the left (with the sink) and...

Worktop mason joint - change male into female?