Hm...there's a lot of problems here. Let's dive in...
1) Envelopes. There's zero envelope generators in this build. And you really need those, since they create amplitude contours (via VCAs), timbral contours (applying envelopes to VCF cutoff, resonance), asymmetrical modulation (applying envelopes to VCO FM inputs), etc etc. This is going to be a serious stumbling block. Yes, you can apply LFO signals as a simple substitute for some of this, but you don't have the ability (as a rule) to specify the parameters of the modulation curve with them.
2) Buffered mult. You don't actually need that; a passive mult will do fine if there's only two oscillators in this. Buffered multiples are used to exactly replicate an inputted signal, often to avoid 'voltage droop' when controlling numerous devices with a single CV. There's not enough here to really justify it, so save some money.
3) Pamela's. Again, this doesn't seem necessary. The module is an eight-channel CV source under a single clock, with one of its main uses being to lock up behavior of/around a sequencer, and there's no sequencer here. Yes, it can output a lot of other things, but using it in that way means that you still won't have proper hands-on control over the parameters that it's outputting, and a big key in using a synth effectively is to have the actual controls at hand to manipulate, not hidden behind some sort of menu structure. If the idea is to use this for envelopes, etc...I wouldn't do that. It simply brings you back to the awful 1980s world of programming through a single data control (think DX7 here), and defeats the whole rationale for working with a modular.
4) Putting an O&C build on 'low priority'. Not a good idea. If you really want one of these, you have to act quickly when they pop up, because the people building these do so on pretty short build runs. The kit versions are not too difficult to come by, but an Ornament and Crime isn't a 'starter kit' build, so if you're not experienced with some complex electronics work, the kit option probably won't work out nicely.
5) Clouds. Doesn't exist anymore, so you'd have to either source a used module or find a third-party build. If the latter, refer to #4 above. Also, what Clouds does is somewhat similar to what the Morphagene does; are two devices of this sort necessary?
The best advice I can give is STOP. Sit back, take a few deep breaths, get the heady aroma of modular out of your head a bit. Modular synths are just as capable as the synths you mention in your post of being eventually uninspiring. Just because there's all these...THINGS...doesn't mean that that factor changes any, it just makes the fiscal outcome of being 'uninspired' way more expensive.
Now, first of all, I can tell you...from experience...that if you're getting bored by your synths, you're probably not spending enough time exploring their capabilities. Granted, Volcas are a bit limited, which is why they're mission-specific, but they still have a lot of abuse potential. Have you looked into any of the hardware hacks for them? Tried 'misapplying' what they do (which was key in the discovery of what the TB-303 could really do, c. 1987)? Also, those are relatively simple synths you're listing; have you considered a hardware synth that allows you to get further 'under the hood' first, something like a Waldorf Blofeld where you basically have a redone version of the PPG wavetable architecture, or something additive such as a Kawai K5000s? Neither are that expensive on the used market, certainly nowhere near the expense of a Eurorack system. Explore more. It's not a good idea at all to take a leap from a Toyota Corolla to a Koenigsegg for going from a first car to a second, and it's not a good idea to go from something very simple like a Minilogue to something that's totally complicated like a modular of any format. Best way you can see this point is if you have some way to access a modular synth for a little while, without assistance...which I recommend to anyone considering taking a flying leap into modular synthesis from an early point in working with electronic music in general. Modular synthesizers are A way of getting toward something new/different, but not THE way. Versteh'?