My handles are solid so my blades aren't full tang. So I drill out enough to get the tang about halfway inside the handle. I use regular 10 min 2 part clear epoxy from the autoparts store. And pin the blade thru the handle with steel stock which is also epoxied in. Haven't had one break yet.

Maybe you could pin your slides with brassand use 2 part epoxy? Maybe 1/8th or 1/16th inch round stock. Might add a little heft. And brass adds sustain. Might be purty too!