If the markers or DME are not available then the system is not complete/cannot be used.
The ILS has been in use since 1938, was developed by Reed Pigman and Sperry jointy at that time, and has many installations where there is no marker, LOM, DME fix, VOR crossing radial etc, and is easy to use.
Pilots should not try to re-invent the wheel nor throw up obstacles to its use, without good reason.
If, on the other hand, you (or your company) using a procedural course reversal ILS procedure without any of the afore mentioned fixes, the choice is quite simple....divert, and land somewhere else, if necessary.
NB.
Capt Pigman, being quite a clever guy, also had a hand in developing the VOR system of navigation