considering you wont need them unless you are doing TFB HM, i dont see the issue.
If you are doing TFB HM, you should have Denova on farm....
Assumeing the above 2 are true, you can get enough comms to make this in about 4 weeks if you include LFG daily's and LFG Operation weeklies.
4 weeks of just grinding towards an implant?! That seems "reasonable" to you huh? lol