Hey Alexandra!
I think this page looks great, and is a fabulous work around for the lack of Wholesale widgets.
I don't have advice because I think you did this wonderfully, but wanted to offer some extra information. Linking to the Etsy Wholesale page is great since the buyer application is right up top. If you want to give buyers a direct link to the application page, you can use the link: www.etsy.com/wholesale/apply/buy
Also, I wanted to let you know about your guest pass if you didn't already. While I wouldn't post your guest pass in a public place, you can give it to buyers that you want to order from you directly if they don't want to go through the buyer application process. This article explains how to access your guest pass and share it with buyers:
https://www.etsy.com/help/article/5243#Q11I don't advise posting this in a public place because doing so gives anyone and everyone access to your Wholesale linesheet. There isn't currently a difference between POs submitted by an approved buyer and through your guest pass, so keeping this hidden until you vet your own buyers helps protect you further.
Great job with this!