This I think is the perfect plan.I guess replacing these 4 and keeping the old ones to service the rest of the house is the best long term answer.
But when you fit the new units make sure that you get comes with replaceable GU10 LEDs. Also you may find that the GU10s look different to the fixed LEDs and that is to do with the degree of beam - many GU10s are 60degree spread almost as spotlights but your fixed unit is likly to be a much wider light spread so try and find 120 degree led bulbs.