Several things here...first, if something's already in a housing, leave it there. Eurorack cab space, when you start figuring it up, is actually pretty spendy and needs to be dedicated to things that must be in there.
Second, Clouds is discontinued. Has been for quite some time. So unless you have one, you need to use a 3rd-party version or source a used one.
The problem with the Moog and BSP is quite real. The BSP only outputs 0-10 V, while the M32's VCO CV in wants to see +/- 5V. And it's not possible to change either one to make them play nicely with each other. Really, a lot of the blame here rests on Moog for using that not-so-compatible CV; it's sort of their 21st century "answer" to their wack S-Trig incompatibility from their early days. I suppose that now that they decided to do positive gate/triggers at last, they felt compelled to screw up on the pitch CVs. However, if you insist on having the M32 in your build, Erica has their PICO MScale module which provides bidirectional rescaling between Moog and everything else in just 3 hp.
Lastly, modulation source of what sort? There's not that much here to go on to figure out an apparent need.