By all means, keep the medical current. But as ever, I'll take a different view regarding the IR. The airlines I have worked for understand that it is extremely expensive for an individual to keep an IR valid. They do want you to be able to fly on instruments and have a valid rating at the the appropriate time, but to always keep it valid when your money could be better spent elsewhere suggests that your priorities may not be sensible. You should be able to sell this at an interview.
As regards VFR flying, hats off to every proponent of that art. That's the most difficult flying I've ever done.