Boot Camp repair via Hybrid MBR fix after 5+ partitions

Question

With the understanding that Boot Camp only formally supports a Windows boot upon creation from a single Mac OSX data partition, I'm trying to determine if a fix exists for the following boot setup. The end result I'm pursing is a triple boot mac setup with Mavericks, Win7, and Ubuntu. This applies to the bootcamp subject because it is not possible to install Windows 7 without Bootcamp due to USB3 drivers at install on this model [2014 Macbook Pro]. Thus making the Win7 Boot Camp task a required first step. The partition edits after this to make room Linux end up messing with the hybrid MBR boot setup that Boot Camp created - resulting in no available Windows boot option. A bit of research tells me that this Boot Camp partition can be repaired with some manual hybrid MBR work as long as a total of 4 partitions are present.
My question is can an alternate (or new) hybrid MBR approach support a fix for an already existing Boot Camp partitions while 5+ partitions exist on the same disk? If at all possible, what are the risks involved?
Current State:
As of now, I have the bootcamp hybrid MBR set up properly with Win 7 working -- though knowing any partition edit will mess this up. Using rEFInd boot manager already, and plan to incorporate that for the final setup. Would be hesitant to drop the Apple Recovery Partition if at all possible.
$ diskutil list
/dev/disk0
   #:      TYPE NAME                                      SIZE                IDENTIFIER
   0:      GUID_partition_scheme                    *251.0 GB       disk0
   1:      EFI EFI                                              209.7 MB        disk0s1
   2:      Apple_HFS Macintosh HD                 210.1 GB        disk0s2
   3:      Apple_Boot Recovery HD                  650.0 MB        disk0s3
   4:      Microsoft Basic Data BOOTCAMP      40.0 GB          disk0s4
The additional that will put me past the supported 4:
5. Ubuntu 14.04
6. Ubuntu SWAP [may be able to avoid this with swap file instead]
7. Shared FAT32 space ~4GB [can also toss this if it puts me one partition over from a resolution]
Thanks in advance, appreciate any input.

Answer 1

sudo gpt -r -vv show disk0
gpt show: disk0: mediasize=251000193024; sectorsize=512; blocks=490234752
gpt show: disk0: Suspicious MBR at sector 0
gpt show: disk0: Pri GPT at sector 1
gpt show: disk0: Sec GPT at sector 490234751
      start       size  index  contents
          0          1         MBR
          1          1         Pri GPT header
          2         32         Pri GPT table
         34          6      
         40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
     409640  410430536      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
  410840176    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
  412109712       1136      
  412110848   78123008      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
  490233856        863      
  490234719         32         Sec GPT table
  490234751          1         Sec GPT header
Is this the MBR readout you're looking for? Have this fdisk one as well:
sudo fdisk /dev/disk0
Disk: /dev/disk0 geometry: 30515/255/63 [490234752 sectors]
Signature: 0xAA55
         Starting       Ending
#: id  cyl  hd sec -  cyl  hd sec [     start -       size]
1: EE 1023 254  63 - 1023 254  63 [         1 -     409639] <Unknown ID>
2: AF 1023 254  63 - 1023 254  63 [    409640 -  410430536] HFS+     
3: AB 1023 254  63 - 1023 254  63 [ 410840176 -    1269536] Darwin Boot
*4: 07 1023 254  63 - 1023 254  63 [ 412110848 -   78123008] HPFS/QNX/AUX
Edit: Having trouble pasting/quoting plaintext