Ross Phaser Univibe Mod

[RCZ53]

Hi Folks....I know there has been alot on this subject to date (and I have read quite a bit of it) Most of what I have seen is the Ropez tonepad circuit. I just scored a 2nd version Ross phaser with the AMZ97C11 monolithic JFET for a nice price. I want to Univibe it. ROG has the schemo. I am wondering what cap values are recommended to replace the four 50uf ....and can one be kept in the circuit as discussed elsewhere? I thought I would add 3 or four mini SPDT switches to affect the cap swap ( I can hear the vintage pedal freaks shudder now.) Any thoughts on this circuit and perhaps where I can insert the vibrato MOD? Thanks all for a brilliant Forum. Also thanks to Rob Strand and Mark Hammer among others that have been so informative on this subject.
regards Roger