JAA - FAA instructor conversion

[pilgrim flyer]

I am proposing to gain my FAA instructor ratings as there would seem to be a market for BFRs/ICCs in the UK.

In addition to my JAA CPL and unrestricted FI (applied instument restriction removed) I hold FAA commercial/multi/instrument.

Any advice on what is required to convert in either the UK or USA would be welcome, as would any views as to whether it's likely to be worthwhile.

Thanks

PF