If you are established on a 3 degree glide slope
Too much of an 'if' for me and seemingly too much of an 'if' for the airline and regulatory authority who developed All Weather Operations, starting with the Trident Autoflare and who have more experience of AWO than possibly many other countries put together. Using IM passage to indicate DH in the absence of the RA is not accepted, not that there are many IMs in service anyway; none in the UK (I think) and very few in Europe, mainly a handful in France. Cat II on a baro not accepted here either (I think, without checking); I only mentioned pressure altimeters to keep it generalized to all markers.
Edited because my post crossed with Capt Stable's. Although I agree with the good Captain that one should not use an MKR to infer height (because that's all one can do,
infer it, not measure it), it seems that at least one State (ICAO, not United)might permit it. Rather them than me!