ECHS should have been fitted to the J from the off, including the underfloor winch but the beancounters won.
The stressed platform concept was/is due for a make over to fit 108 inch width, but considering the MSP has been around since 1950 and was originally sized to fit the C-82 and C-119, the UK has had its monies worth. Any replacement should match/beat the MSP/HSP capability, the Type 5 platform doesn't, simples.
Incidently, the original specification for the A400M CHS included an underfloor winch, it was removed early on by the beancounters.