My apologies. Didn't intend to sound like I was telling you what to do. I like the AK platform because they are fairly light.
The Galil handles were attached to the rear handguard bracket, you may be able to find one with the handle. It may take some work to get it to work with the handguard you have on the gun now. They index partly on the barrel shank where it comes out of the receiver, and your's may be slightly different size. With some head scratching you could likely get it to adapt. I had one from a parts kit, think I sold the handguard, front and rear brackets, and handle for about $20 or $25.
I have a drum, they are pretty heavy when loaded.
The valmet-weapons.com site has a board with parts for sale. There are several regulars that sell original Israeli or South African R4 (Galil copy)parts there.
I don't think the receiver top cover would take the strain of a handle for long, nobody has done a handle on a top cover that I'v heard of.