CS if you don’t require any light where the old pendant was, just use one of the new cut out discs you’ve made with the holesaw for installing the new downlights, then screw the disc in and use filler to blend in where the pendant was.
Aurora fittings you’re looking at are good. Just make sure you buy the correct size holesaw. Depending on how you’re wiring them and in what cable you might want to factor in a 5amp joint box per fitting, twin and earth to joint box then flex from joint box to fitting.
spegsteratmsndotcom if you require anymore info/help.