I'd toss an oral to kick start or a shorter ester.
Then increase the test around week 6-8, whenever you notice gains slow. Don't increase it too much, maybe 125mg for half the weeks left then up another 125mg for the remaining.
Are you going to use HCG on cycle? That's a long time if you aren't going to. Shut down is going to suck.
You could also add something mild on the back end for the last 6 weeks or so like some VAR or Epi.
Lots of guys kickstart with superdrol for 4 weeks, keep their test the same the entire time and end with 4 weeks of Epi. I've never done this exactly.
I kick started with test prop (I was avoiding methlys) and the last 6 weeks I added var and the last 4 weeks I used TNE. Worked pretty well.
Test only cycles are great, but don't get overly excited bc the protocol above you won't even really feel much until week 2 at the earliest. Maybe week 3 or 4.
Either way, good luck and make sure you have your PCT IN HAND just in case you have to start early for any reason.
Morry