There were many extremist right wing parties in Germany at the time; one or more of them would have filled the vacuum.
No !
No other right wing and esp. no other right wing extremist party would have been able to fill the vacuum left by ... Hitler.
Hitlers personality or better his charisma was essential to get all the other rightwingers together and more important
hold them together.
(Most prominet example : Bamberg convention to get the Strassers together with Goebbels back following and accepting him as
The Leader.)
There might be some grow of i.e. DVFP under Albrecht von Graefe, Ludendorff, ev. Roßbach as the "SA"-part. But they would dwindle and dissassamble quickly, changing parties and names, founding new ones even more dissipating their potential, with no other chasrismatic leader in sight.
The "winner" of this on the right wing would most likely be the conservative monarchistic DNVP under Hugenberg, but not to the extent to become as big as the NSDAP became.
However, a
very conservative turn of the Weimar Republic during and after the Great Depression, aimed at bringing the ToV to fall (with some quite good outlook to do so in a longer run, than achieved by Hitler) is highly probable - IMHO.