Part replacer for VAB/SPH

[Atoning Unifex]

So many times I've come across a situation where I want to change a single part, maybe an engine, or fuel tank, but it is buried so 'deep' in the staging or under radially mounted items that it's a real chore to dismantle and rebuild, just for that single piece.

I think it would be great if there was some kind of replacement function so I could simply select the old and new parts and switch them without any hassle.

Ideally I'd like to be able to switch any part with any other, however this might be tricky in terms of automatic placement so instead maybe limiting the replacement function so that you can only replace parts with like parts (engines for engines) or maybe by diameter.

In the same vein maybe also having an insert or delete function allowing parts to be slot in or removed?