I've taken an interest in getting better sb/o3 patches for sbiload in Linux as well.
Unless a programmer can convert bnk or op3 banks into sbiload banks, then I believe the only way is to use Glib (console) or xgl (X11) from glib19f.tar.gz.
I've tried both glib and xgl running under Slackware 7.1 in QEMU but I find them difficult to use.
Glib uses h, j, k, and l to navigate, and J and K to increase/decrease the values.
xgl increases values with a click, but to decrease values, you have to right-click and go into a popup menu.
There is a way to change the keys in Glib specified in the source code, so that is what I plan to try next.
I'd like to use a, s, w, d to navigate, and + and - to change values.
Here's some screenshots of the 2 programs editing the 1st instrument in std.o3 and std.sb.
Glib and xgl have the same parameters as you'd see in SBTimbre but additionally have reverb and chorus.
Win 11 - Intel i7-1360p - 32 GB - Intel Iris Xe - Cubilux 7.1 USB