A heavy EC135/H145 wont climb more than ~2-300ft/min at Vy and continous OEI power. 2 min power until reaching a safe altitude have always been promoted by the instructors.
Airbus changed the H145 (in 2024?) CAT A VTOL/RTOL OEI continued take off profile to use 30 power for acceleration to VTOSS and then 2 power for climbing with VTOSS to 1000 ft AGL. Curiously clear heliport profile still insist 200 ft acceleration to VY.
One more thing to consider is that some current engines are capable of producing that extra power fo a period far exceeding the 230 time originaiting from regulatuon.