Removing the AD flags from the advertising packet

OK, this is going to be a strange request, but I want to check if it's possible.
Thegapm_start_advertise_cmdstruct contains agapm_adv_hoststruct, which contains theadv_data_lenand theadv_data:

/// Advertising data length - maximum 28 bytes, 3 bytes are reserved to set
/// Advertising AD type flags, shall not be set in advertising data
uint8_t adv_data_len;
/// Advertising data
uint8_t adv_data[ADV_DATA_LEN-3];

As stated in the comment, 3 more bytes are sent in addition to theadv_data- an ad-structure of: 0x02, 0x01, flags-byte (length, ad-type of "flags", value).
Is it possible to remove this ad-structure and control the whole 31 bytes directly?

The reason I'm requesting this feature is that I want to advertise an iBeacon packet, similar to:http://stackoverflow.com/questions/18906988/what-is-the-ibeacon-bluetoot...
(the first 3-bytes ad-structure 0x02, 0x01, 0x1A is not really necessary - iOS detects the iBeacon even without it).

The 27 bytes that the iBeacon format requires leaves me exactly 4 bytes to send additional data: 2 bytes for the ad-structure header (0x03, 0x08 for "shortened local name") and 2 bytes of value.

Obviously, I can send the additional information in the scan-response packet, but this reduces the probability that the additional information is received.

I know that I may not be following the BLE\GAP\GATT standards...