I am prepared to take acl responsibilities and liabilities in relation to my product....
No, you don't get to do that.
As a retail seller, you'll be taking on compete liability for the whole of the product.
That's why all those car makers had to replace all those faulty Takata brand airbags, at their expense,
and didn't get to leave
their customers to chase Takata.
The way you currently propose it, if you sell this product, and, say, the screen doesn't work, then that will be on you too.
You don't get fob off a faulty, say, screen on the maker. Especially not after you have modified the product yourself.
...and my product isn’t not an accessory however entirely new reskinned product with some pre-existing manufactured internals.
Unless you're buying the screens wholesale, and you have a licence from the manufacturers,
your product not new in the hands of your customer.
You're selling used products, with unauthorised aftermarket mods.
In relation to your first point, “then sell it on, as though it is theirs not yours,” i am aware that un-consentually selling a product on the behalf of another company is illegal however what are the legal implications of selling the product I have described under my name?
Well for one thing, it isn't substantially your product.
So, as I said above, you're at risk of a merciless passing off action.
Some further legal implications are that you will be misleading your customer about the item being new, and
misleading them about about their ACL entitlements.