Custom backorder and outofstock behaviour

I have made a plugin for my woocommerce that automatically imports data for my suppliers and store them in custom metadata to specific products. I save information like supplier stock, supplier next availabiliy date and quantity.

So for example i could have a product that has internal stock 0 but maybe i have 10 of them available at the supplier. I would also like that for some of those items to keep backorder at no, but when i try to save a product with backorder no that has 0 quantity in stock it automatically become outofstock and so it’s excluded from searches and purchases! How can add a filter or something like this to block the automatic features that put a product outofstock when some custom metadata have a specific value?

A similar thing has to be done in search results, because it seems that articles with backorders no and quantity 0 are excluded from search results, even if they have stockstatus to instock.

Can someone help me in this case?

Thank you