I have a PIFR(SE) which is not current, however I have done a MECIR renewal in the last 12 months but due to it being summer have not logged sufficient instrument time for the MECIR to be current.
The regs are the last thing I'd be thinking about. Instead I'd be considering what I thought was safe, which doesn't sound like this. You should find a friendly local simulator and try and get on it once a month. And don't be lazy. Do the full checklist deal and practice some emergencies. Beyond legalities, you might also consider a second pilot for your first IFR flight.
Single pilot, multi engine IFR is statistically one of the most dangerous things you can do. You've got to think about a safety / currency strategy that is somewhere between the legal requirement and common airline practice