8 MHz signal BW is probably critical for overall feedback, but not excluding it completely. Alternatively stagewise internal feedback may be used. It can be expected to have lower linearity and gain (current) accuracy than overall feedback, but can achieve stability more easily. As the amplifier would most likely use a class AB mode, some crossover distortion can't be avoided. With internal feedback, it would appear in output current undiminished.
I want to ask a colleague, who made his PhD on current amplifiers about suitable literature. I probably met him within the next days.
Apart from bandwidth, the expectable load impedance range and the intended relative and absolute current accuracy are important parameters. With some types of load impedance, a ususal power OP with overall feedback can be an easy solution, I think.