The weather is getting better – the summer is coming – you can probably log another 350 hours instructing before the fall. Then buy some multi engine time. Why go the PFT route, spend all this money, gain little or no valuable experience, and get all the stigma associated with PFT for the rest of your carrier? If you are just starting out you may (still should not) justify it. In your case – you are already a CFI and need only 350 hours! Go get it and have fun!