Ian
Reading through this should help you decide.
http://www.beadelltours.com.au/tyre_information.html
Don't forget to click on the tyre repair demonstration link the the top of the page then open the list of 34 photos.
Whether you use one piece rims or splits depends a lot on how far you want to go to repair punctures. The little plug kits that many people take with them can easily get you out of trouble with some punctures in tubeless tyres but definitely not all punctures. Some will need large reinforced patches or combination plugs that have to be applied from the inside. That is where wheel choice comes into play. If you can take your tyres off a one piece rim without any trouble then you don't need split rims. If you can't then you will need them.
The only exception to that is if you are using very heavy cross plies like an MRF 7.50 x 16. You will have no hope of getting them on and off a one piece rim. Tyres like that are used extensively for cross country driving all over the Outback and are the reason why Toyota still makes split rims for the Cruiser ute and troopy.
If you do use splits then don't forget a few vital points. One is keep the inside of the tyre as well as the tube clean during assembly. Dirt or sand can rub through the tube. Put chalk powder inside the tyre and rub it all over the tube. Seal the valve stem hole and the removable ring gap with something like roof and gutter sealer from Bunnings. That will keep sand and water out of the tyre. I also put a tiny bead of it right around between the ring and the wheel then run my finger over it. I don't know if it is possible for water to get in through there but it is easy enough to do so I thought why not?
Don't worry about all of the rubbish that you read on the net about them being dangerous and likely to blow your head off while inflating them. The ring fits like a circlip into a grove about 6 m deep in the wheel. It also extends back inside for about 40 mm. The shape of that section inside is identical in shape to the other side of the wheel. The steel reinforced bead of the tyre is sitting on top of it as well as pressing sideways on the visible section outside. Getting the ring out of there during inflation would be like placing a radiator hose clamp on top of a circlip sitting in a groove on a steel shaft then trying to remove the clip without removing the clamp.
The ring is never going to come off unless it is damaged and not seating properly or the ring/ wheel or both are very severely rusted.