Remote Keyless Entry Fob Replacement

[Freds_gmc]

Hopefully this is the right place to ask this question. Just purchased a 2005 Gmc Sierra, the dealership I bought it from only had one key and one keyless enty fob, the fob is from a Nordic remote car starter. My question is can I get a couple original remote keyless entry fobs from the GM dealer, and will they still work without having to remove the remote starter ? Is it a big deal to program the GM fobs to work like the original GMC specs ? I like the remote starter, but 95% of the time won't use it and just want to use the regular GM entry fobs. Will both the GM and Nordic work at the same time to open/lock the doors ? Thanks in advance, Fred