You can use Gibson Assembly to clone gene of your interest at the specific site. You need to PCR amplify your gene with primers having 20 to 25 bp overlapping arms at the site where you want to clone. Total size of each forward and reverse primer will be 45 to 50 bp containing Sequence corresponding to your gene (20-25 bp) + overlapping arms at site of cloning (20 - 25 bp). You can use Gibson assembly kit from NEB. This technique is very effective and efficient, if done correctly.