Another option to consider is adding a tuning-slide trigger to your Sovereign.
Just so everyone has some more info. I am in the works of getting a Besson trigger installed on my 1985 967. I'm using Lee Stofer for the work, but the kit from Besson will cost $450 U.S. and ships from Europe taking about 45 days, no kits are kept in stock in the U.S. Which the shipping time may be less of an issue for our OP.
Adams E1 SS, Gold Brass Body .6mm DE Euph N103 Jcup, J9 shank
Meinl Weston 2141 Eb Tuba PT 84
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