IR Recency is it worth it?
If you are not actively flying and you are just waiting for new vacancies to turn up, keeping yourself IR current is not going to give you any tangible advantage, so not a good Idea to waste money on.
If you do want to keep your instrument scan and other skills current, you can always find out cheaper options like a PC based flight trainer, this may sound stupid... but a free advice.
An Instrument rating on Multi Engine aircraft is always better than one just on single engine.
If you haven't already flown a multi engine aircraft you will need a bare minimum of 10 hrs of flight training on Multi Engine for your ME-IR endorsement.