There's no real advantage to an Apo-El in this case over a regular Apo Nikkor other than one stop of speed. Besides, the last 300 for 8x10 I recall ever being sold went for something like ten grand. 305
regular apos go for a tenth of that. The Rodagon G is the only conventional enlarging lens made for
mural-sized magnification with medium format film. There are numerous ways to make dodging/burning masks to register to the original. You can simply use frosted mylar and smudged pencil, or more neatly, layer up dilute red creocin dye, just like it was done for decades. Generally way
faster to do it the old way than scanning and Fauxtoshopping.