I was referring to the woo version sorry. Honestly this time I'm too lazy (or busy) knowing woo so well that i don't even want to try anything else atm.
About the upload script: what could be interesting is finding a way to add docs/mockup attachments to each bought product/variations (hidden to customer ofc) that could be passed to supplier at checkout (without the need to edit the mockup everytime for every customer) ... So supplier has the psd mockup with original font used + customer notes to add up to it, so no more manual stuff from us except order.
But that's too specific to justify a custom alidropship development here. That's the best part of Printful, all is automated thanks to their plugin but their margins sucks, really.
Interest print is nice, great product choices, well sorted, but their mockup editor sucks big time, you can not do symetric patterns well, and all orders have to be done manually to...
So this Aliexpress POD Alternative seems interesting.
Same about Woo, I drastically reduced number of plugins to a minimum like you. Elementor + Litespeed cache helped a lot in this area. Also use only sucuri security plugins, wordfence takes far too much entries in the db. I keep it simple now. I'll also drop yoast for the same reason for AIO SEO. Still use GDLP?