Heh, I hear ya! I have TOO MANY wild hairs right now 
(In a good way, R & D has so many great changes coming, but that also means they are tapped out for the next few releases)
But I am happy to consult on how to build it in an SEO friendly way here on the boards, as I actually do believe there is huge value in it (not just for SEO, but also for the vendor/partnership angle) - might be a good colab project.
I anyone wants to take it on or understand the value:
#1: There is SEO value in having hyper local vetted content (such as a vendor list that is robust with unique content) - it should help wtih E-E-A-T as well.
#2: You can use it for backlinks - hey, we’ve listed you in our directory as a preferred vendor (because you’re awesome) here is some HTML to put on your website that shows you are a verified partner (this is an image or backlink that links to you, improving your SEO)
#3: Networking (old school!) - it’s giving you a reason to engage with high quality vendors in your area, connect and remind them that you are a progressive marketer who is always looking to add value to your partners - they will remember this, and recommend you more often.
If anyone does want to build it, let me know here on the boards, and I’ll tell you exactly how I would do it (which will save you some time, money and also make it the best it can be)