Default [Q] Stock 2.3.3 to gingerbread custom rom okay?

would it be alright to go from stock 2.2.3 (JVD/JV5/JV6, H3G)to then flash a gingerbread upwards custom rom?
i know there's issues with the bootloaders downgrading from 2.2.3 to froyo stock
if its okay, how would i go about it?