Found my original attempt by modifying /usr/src/sys/amd64/vmm/x86.c
Unified diff follows, but this didn't work for me.
("bhyve_id[]" commented out to prevent compiler complaints)
There doesn't seem to be support for CPUID 0x40000001 in bhyve either.

--- x86.c.orig  2016-09-11 14:40:22.410462000 +0100
+++ x86.c       2016-09-11 15:53:14.182186000 +0100
@@ -52,7 +52,7 @@

 #define        CPUID_VM_HIGH           0x40000000

-static const char bhyve_id[12] = "bhyve bhyve ";
+/* static const char bhyve_id[12] = "bhyve bhyve "; */

 static uint64_t bhyve_xcpuids;
SYSCTL_ULONG(_hw_vmm, OID_AUTO, bhyve_xcpuids, CTLFLAG_RW, &bhyve_xcpuids, 0,
@@ -236,7 +236,7 @@
                        regs[2] &= ~(CPUID2_VMX | CPUID2_EST | CPUID2_TM2);
                        regs[2] &= ~(CPUID2_SMX);

-                       regs[2] |= CPUID2_HV;
+                       /* regs[2] |= CPUID2_HV; */

                        if (x2apic_state != X2APIC_DISABLED)
                                regs[2] |= CPUID2_X2APIC;
@@ -463,12 +463,15 @@
                        }
                        break;

+               /*
+                * Don't expose KVM to guest
                case 0x40000000:
                        regs[0] = CPUID_VM_HIGH;
                        bcopy(bhyve_id, &regs[1], 4);
                        bcopy(bhyve_id + 4, &regs[2], 4);
                        bcopy(bhyve_id + 8, &regs[3], 4);
                        break;
+               */

                default:
                        /*

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