You'll have to remind the controller if it looks like he or she is so
busy so that you're going to get a slam dunk approach. I think you can
descend in a hold, south of DEPRE, left turns (see earlier posts in
this thread from me) until you intercept the GS. However, I wouldn't
try this if the frequency is busy and you can't tell the controller
what you're up to. If the frequency is so busy, I'd descend no lower
than MSA, follow the LOC and then declare missed above the airport.