No, go ahead and do it. Although there is nothing extra to do if you let it go past the expiry date by a few months either.
As an aside, if you're finding not flying as PIC troublesome and it's going to take a while to sort the class 2, you could always get an NPPL with SSEA class rating issued for now, which would get you flying again. I'm assuming here that the "minor heart condition" hasn't come with a recommendation not to drive a car?