I don't know of any aftermarket dials for the Leon so I believe OEM is your only option. Not to put a downer on things but based on the very small number of early facelift FR models that appear to have had the FR logo dials fitted, the chances of getting some secondhand ones are probably very slim to none. If any do ever come up for sale then I expect a house remortgage would probably be in order to actually purchase a set.
Also, keep in mind that the instrument cluster contains the immobiliser, so as well as getting a replacement cluster coded to your car, you would also need to get the relevant immobiliser data transferred from your existing cluster to the replacement one. The facelift Leons have the 5th generation VAG immobiliser and VCDS doesn't currently support anything beyond the 4th generation immobiliser. So you may need to get a dealer/specialist to try and do the instrument cluster swap for you which probably won't be cheap. I'm not sure if anyone with a facelift Leon has ever done an instrument cluster transplant with another secondhand unit before but if someone is aware of a such a case the it would be interesting to know.
It would most likely end up costing a lot of money just for a few white needles and an FR logo on the dial face.