Ok, well I am gonna look again. BUT the only thing I can see which would be the easiest way is somehow get on

HIGHWAY 60 from the expressway. It might be an exit since for some part of the way they run parallel right next to each other and then cross each other.

US 301 N to 60 could work too! and 301 is perpendicular with the Crosstown (618).

BUT to be honest I would take I-275 to Hillsborough Avenue and then follow the other directions from above. The other ways just end up making directions a lot more difficult to follow. PINELLAS COUNTY AND HILLSBOROUGH COUNTY ARE CRAZY WITH TRAFFIC. I'll leave it up to you and get back with me and maybe we can work together on directions.