If you make up your own mounting brackets or customise the original mounting brackets I'm sure as long as they fit in width wise you can make any seats fit.
Yeah I live just outside of Louth in a small Village good to hear there are more people from around this area its Land Rover country here in rural Lincolnshire :P
Will be one up market Defender :P Anything is possible its just the amount of work, time and engineering needed to make it possible anyways good luck be interested to see how you get on.
Matt