As I pointed out in your last thread ( Alter training for poor health? - #3 by Radnor80 ), this is more appropriate for discussion via an individualized consultation, as many of the details here are beyond the scope of what we can realistically cover via the forum.
1- Unfortunately I can’t predict the effects of UDCA here with confidence. Regardless, I’m more concerned with the wall-adherent nodular echoes (which sound like they could potentially represent gallbladder polyps and an associated risk of cancer).
2- I do not think that restrictive of a diet is necessary, especially for an asymptomatic patient.
3- WPI is fine, assuming third-party testing for purity/lack of contamination.
4- The list of potential causes for splenomegaly is lengthy and complex; again, beyond the scope of this forum.