Interesting for me. I have always flown IFR under jurisdictions that required at least two NAV receivers, which in this case i would personally view as the minimum to legally fly that procedure as the reception of the VFA DME is required.
Now, one could argue that it is no longer required after the start of the inbound turn as all DME distances inbound are both given for IIF and VFA, however the note doesn't make that distinction and therefore reception (or a legal substitute) of VFA DME throughout the whole procedure seems to be required.
I guess in the real world nobody would really care, but then, bobody would fly the whole procedure anyway, always got a clearance direct GEBTI from about 100NM or so out and flew it from there.