this is exactly the approach I usually recommend: get a decent lens with some ugly and large rear cap in shape of a FED5. 8)
BTW, the L/Z version is still in production (http://www.lzos.ru/en/ind_61_l3.htm), the L/D should be available in it´s last version with NOS FEDs.
Zhenya, LZOS lists the J9 as "not available" - did they pull it from production? :-(