No need to drill holes if you use strong tape to hold everything in place until you apply clamping pressure.
I agree with Badger. It's pretty dodge to cut to center anyway on a wood bow and with the powerlam going south it further weakens that potentially bow breaking weakness. The further to center you cut the stiffer your shafts need to be....a 60# bow cut to center for me would need 70# shafts. Good 70# spine wood shafts are hard to find.....
You have nothing to lose tillering it now (if it blows it blows) but personally cutting to center needs an I-beam in my eyes.