Don't get rid of the rads. Keep them as a second stage for really cold days. Turn the boiler max temp down to 50C and see if it will still provide the heat you need.. Oil usually needs a higher water temp but it all depends on how much m3 of radiator you have.
Use a Fujitsu or Mitsubishi ductless where you can, in the bigger rooms, You may need 2 of them for 200m2 house. These are be best performing units (highest efficiency) and the 3.5-4kw ones are the best. Really, you should have a heat loss done on the house to determine what size to use.
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