https://www.muffwiggler.com/forum/viewtopic.php?t=137105&start=all&postdays=0&postorder=asc&sid=3ef1fe17aeeff7d7fd87444b7188ac69
mentions that by mixing the input with 2 x the BP filter, you'll get an all pass filter. The same does this pdf:
https://www.analog.com/media/en/training-seminars/tutorials/MT-223.pdf
I tried this with some success. I had to disconnect the 33k resonance resistor, but after this I got a response with a slight 667 mdB notch.
I will try breadboarding this later.
The MT-223-pdf also mentions an alternative way of doing a notch filter:
Which gives this notch:
As opposed to the notch we get by mixing LP and HP:
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