Sorry, this is the trim we're waiting on: https://www.build.com/hansgrohe-15763/s1152646?uid=2756153. The valve is the iBox Universal Plus Rough with Service Stops, ¾" (Part no. : 01850181.) From what I can tell that works with Axor too, but they don't appear to have anything in matte black.

I so regret using Hansgrohe - I originally planned to go with Kohler or Delta but I did too much reserach and thought this was a more reliable choice. Now I may be stuck with either a very expensive mismatch or a possibly never-ending wait to use my new shower!

Amazon has them...about a week delivery (might be able to expedite). Be sure to select the black one. I really like my Hansgrohe products, excellent quality.

https://www.amazon.com/Select-Thermostatic-Trim-Function-Finish/dp/B00HWFLKPU/ref=sr_1_4_sspa

You can put chrome for now and then switch it out to black when it's available. The trim comes with the cartridge, so you can reuse that and then perhaps Ferguson's can get you just the parts you need in black, less the cartridge, when it's available.

Thank you both! I was hoping for some miracle solution but I don't think there is one. I read enough here to know that replacing the valve would be messy and costly, so unfortunately that's out.

@catbuilder I could install the chrome temporarily, although it will cost me another $500+ for the trim and then to pay separately for install whenever it arrives since I assume my builders will have moved on by then! I'm spending like a drunken sailor at this stage of the project, but it's hard to feel good about paying a bunch more money just to get what I ordered back in October.

@badabing2 I don't think Amazon has the trim in Matte Black. Fergusons is offering me Black Chrome - based on the website pictures, I don't think that's much better than regular chrome.

I don't have any specific advice except to commiserate regarding the spending. by the end of my gut remodel, I was laughing about all the anxiety I had about spending a bit extra at the beginning for some stuff because it was all so meaningless in terms of what the costs ballooned to. :-) I remember wondering whether I should spring for the extra $2000 for the tiles I really loved - yes I did and I don't regret it FWIW.

My analogous spend at the end was getting sconces for the two bathrooms and my bedroom because California had just passed a law that any lighting permanently affixed could ONLY take LED bulbs. There were almost no choices available as most of the ones then being sold took either LED or regular bulbs. I wound up buy SIX that were the only ones that my designer could source so that my place could be inspected - bathrooms couldn't get their final sign off from the inspector until sconces were installed. They weren't that expensive - about $60 per sconce which came to about $400 plus tax. I wound up giving them away to a friend when I replaced them with ones I actually wanted - and yes the ones in place do have LED bulbs so they are green but hey also can take regular bulbs. So that was $400 plus whatever I was charged by the electrician to install and take down and install. At the end, I just laughed at moved on.

@CeltiaKris, I can't thank you enough for this detailed explanation. I tried to get smart about the plumbing stuff back when I placed the order, but what (very) little I absorbed has not managed to stay in my head. I'm so grateful to you for sharing your wisdom on this! I will talk through with Fergusons the best way forward - whatever is the right balance of effort & cost. I'm glad that it may be possible to get it right in the end - I don't mind compromising in general but it sort of killed me to think I went to all this effort and now the plumbing is going to be a mishmash!

@Helen I'm glad you got your tile! I started off trying to be sensible but I learned from a previous small kitchen project that sometimes it's just better to get what you want rather than spending a decade wishing you'd done the fancier sink (in my case!) Still, as the project goes along it just seems to have become a little too easy to throw money at every problem - or to use this opportunity to fix every last flaw in the house and the furnishings. I'll be relieved when it's all done just so I can stop shopping! Never thought I'd say that!