I use the plastic/resin type of clips with straps, and my original Giant resin platform pedals (factory) also didn't have any place to attach them... I bought a set of no-name metal-wrapped alloy pedals for about $14 years ago (actually they are much better quality than the factory Giant's anyway), and they have reflectors on front and back faces. You just pop put the reflector from the front side, it has expanded plastic studs that go into 2 holes on the metal wrapping; those holes are aligned to attach the clips to when the reflector is removed. After 7500km of riding, the no-name pedals are still going strong with no sign whatsoever of bearings getting stiff, or any play in them either.

Currently, these all-alloy ones from Mountain Equipment Coop (in Canada) would work (same deal with the reflectors), look fairly good and get good reviews, for $12...

https://www.mec.ca/en/product/4013-710/VP-565-Pedals

These are the ones I have, a little more expensive these days than they were 10+ years ago at $22, but still pretty affordable:

https://www.mec.ca/en/product/4007-271/VP-196-Pedals

Cheers
TRJB