Eorr, as an accomplished wood worker I'm sure you appreciate and value the process from beginning to end. There are ways to lessen the tedious processes of making wood bows like using a band saw or a hatchet to remove bulk wood and bark and removing or reducing the sapwood. Try to get a cleanly chased back ring with a band saw. The tedious work with a drawknife and scraper is the most effective way to accomplish this.
One reason I began to build wood bows(starting in the late 80s) was to get back close to the roots of archery. Granted I am still using modern tools and methods but that is changing somewhat too. I enjoy the entire process and feel a real sense of accomplishment when I have completed a simple but viable hunting weapon. This sense of accomplishment is what keep me interested in wood bow making.
A "coopers" bench,"bowyers" bench or draw horse, whatever you want to call it is not necessary to build a wood bow but it sure makes life easier. Check out some of Jamie Leffler's build alongs where he is using only primitive tools. He uses a piece of cordage attached to the bow stave and his foot to secure the stave to be able to work on it. He has proven over and over again that it can be done and has also proved that viable hunting bows can be made without the use of modern tools. I personally find it very difficult in these modern times to be able to think or work primitively but that is my ultimate goal and eventually, with lots of hard, tedious work and many failures I will accomplish this task or at least be satisfied with what I have achieved in the end.
Please don't take this as a scolding. Just my thoughts on the matter!