Can cylinder sleeves be installed in a non sleeved OM615 engine

I've recently found out here that later 220D engines had factory sleeves.But my 68' 115 series Mercedes came with a non sleeved 220D engine.I have two of these engines which both run great,but burn more oil then I like.I would like to rebuild my spare engine better then origional.And I would love to install cylinder sleeves if possible due to the poor quality of the origional cylinder bores.But I don't know if it can be done or not to these particular engines.I want to keep the car mostly origional because I love the style and simplicity of the old Benzes.And yes I'm an experienced mechanic,so please feel free to get technical.I'm just new to Mercedes cars.
And I plan on converting it to SVO/WVO use after rebuilding.The car came with a factory service manual.But I need more info on what I can and can't do during the rebuild.