When I looked into it for my diver I was told Gen plots will not fit on JF properly without modification nor will a gen strap, however I believe they are interchangeable on Noob divers. The best route to take is a custom strap from a Strap maker on here such as Vic etc. which will come with inserts in the strap so there is no gap when mounted. If the gap doesn't bother you then you might be able to do what you are asking, but if you want a perfect fit with no gap I would highly recommend a custom strap.
From what I recall, Gen plots run a couple hundred bucks 200-400, Gen leather strap will run you another 600-700 or so, if you want rubber they're around 300-400 for Gen rubber. Then there will be considerable costs for modifications and shipping etc. All prices in USD.
Just buy a custom strap made to your exact specifications, we have great strap makers here who can make you anything you want.
If you don't want to wait for a strap to be custom made or just want a great deal in general you can check out
donerix's Strap of the Day sales. He has plenty of very reasonably priced straps that he posts almost daily.
https://forum.replica-watch.info/fo...onerix-sod-strap-of-the-day-sale-january-2019