The Ink-Pot and the Palette

Jettisoning would be more work in the short term but more satisfying in the long term, I would think. You probably aren't gOing to have as much energy for decluttering when you're done with the remodel than you are now, but I know that when you have a lot of energy for a specific project it's irritating to focus on something else, so you may not want to get into it right now. I think it's a "pain now, or pain later" question. If it were me, I would hate to deal with putting all the old stuff in the new space. I'd want it cleared out. Since you're not doing all the work yourself, it might be that you'll have time for discarding the flotsam and jetsom in the meantime