I've been a member of ATARN for many years.
Mulberry, Hard Maple, Ash, and Bamboo are core woods for certain cultures. Not oak or hickory or osage. which were not Central Asian wood species.
Those 'glass with wooden siyahs (not recurves) bows are made both by the cheap makers and some of the best like Toth.
There is no substitute for that fiberglass strip except to go to a full-blown wood-horn-sinew bow, and that can takes years to master. Go to ATARN.net or the ATARN page on Farcebook and look at the work of Jason Beever, Beaumont Vance and some of the others.
It can take more than a year of esperimentation to find the right natural glue (hide, sinew or fish bladder) or combination of glues to make wood-horn-sinew work for you and your environment. Modern synthetic glues simply do not hold things together perperly.
Likewise finding good horn and sinew and learning to work with them are expensive and lengthy processes.
There is no substitute for horn except fiberglass.
There is no substitute for sinew.
Some of us make wood and glass composite bows in those ancient Asian designs.