Hi Nicolas,
I've only paraphrased what you have said previously and which you repeat here. You have argued that there isn't the demand for handling variants with Google products (unnecessary) and that it is very complex (can't be done), but let's not argue about that. It's not my intention to cause offence as I have every respect for what you have achieved with Hikashop,
I am by no means a programmer but have managed to make a version of the plugin that works with variants, it took me time but it wasn't technically that hard (thanks in part to your responses to my questions) but there are performance issues. It works with my site that has only 600 variants but Hal has tried it and gets time outs with 3000 variants. I suspect that this is largely due to the way the plugin is written, by loading all the product data into an array and using nested polling loops to process it which seems to me to be a very resource intensive way of doing it. In my post above I have offered to share what I have done with you if you can look at the parts that use these arrays and have them rewritten to be more efficient, maybe by using smarter SQL queries.
I'm not in a position to give you millions of euros, if I were I wouldn't still be working at this time of night, but I have given you several hundred for a product which has a very extensive feature list already, but frustratingly some features that don't work as well or as fully as might be expected. This has cost me a lot, hence my frustration.
If you can't help with this then I'll carry on but it will take a lot longer, and when I have it ready you can pay me some of those euros
Ian