Lost Comms, altitude for early arrival at a HILPT?

I have an FAA-land lost comms question, and I'm wondering 1) what's the most correct application of the regs, 2) what does ATC really expect and 3) what are you folks actually doing?

Let's say you're IFR to OKC, 10,000', ETA 1500z. Clearance limit is OKC, as filed (which includes ATREC intersection). You lose comms en route, in IMC, prior to arrival at ATREC, which is an IAF for ILS 17L. You actually arrive at ATREC at 1450z.

Regs say that you wait in the HILPT until 1500z, but at what altitude? Charted HILPT is at 5-6k. I *think* you'd hold at 10k, then start descent at 1500z. I think 91.185 governs this under lost comms, superseding the altitude restrictions on the approach because you haven't actually *commenced the approach* until 1500z, yes? That's question #1.

What about questions #2 and #3? I'm asking because there was some disagreement at the water cooler about actually needing to wait vs proceeding inbound immediately, particularly in a radar environment.