Canadians makes it simple i think , I quote from their instruments flight rules-arrival procedures-approach clearance : A clearance for an approach may not include any intermediate altitude restrictions. The pilot may receive this clearance while the aircraft is still a considerable distance from the airport, in either a radar or non-radar environment. In these cases, the pilot may descend, at his/her convenience, to whichever is the lowest of the following IFR altitudes applicable to the position of the aircraft:
a.Minimum Enroute Altitude (MEA);
b.published transition or feeder route altitude:
C.Minimum Sector Altitude (MSA) specified on the appropriate
instrument approach chart;
……
I agree that FL75 is a minimum published (MEA) between to fixes, but that one still apply at DIXIR. If in doubt in these situations I would seek ATC clarification or stating intention to which altitude we intend to descend initially,if ATC is not okay with that they let you know that way.