0.8mm BGA package and PCB pooling services

[homebrew]

I'm trying to design a prototype system around an ARM Microcontroller (ATSAMA5D31A-CUR). Unfortunately it comes in a 324 ball  LFBGA package. I'm not scared by BGA per se but it pushes on the limits that the standard PCB manufacturers are able to do in a pool service.

As this is my personal fun project I cannot spend a fortune on the PCB. $200 is the limit I did set myself for the PCB (4-layer).
Under this conditions the best options I could find were 0.2mm finished hole size and 0.125 mm clearance & restring.

Now to the problem: Doing a standard "dog-bone" fanout seems just not possible with these dimensions. However, pushing them a little yields the desired results. With a wire-to-via clearence of 0.117mm and a restring of 0.12mm I get pass the DRC-check.

So, this is a 6.4% deviation in the clearance and a 4% deviation on the restring.

What are my chances of getting a working board? Is it even worth trying?

[Alex Eisenhut]

Me, I'm lazy. I'd buy a Beaglebone. If not, well, there are better breakout patterns than that one.

http://www.npiservices.com/wp-content/uploads/2011/11/Mentor_Graphics_BGA_Fanout_Patterns_-_Pfeil_03c.pdf
http://www.aetpcb.com/aet/net_resources/help/BGA_Breakouts_and_Routing.pdf