Are you saying AVO actually fabricate new struts to order?
Yes of course. AVO, Leda, Gaz and the like will all make struts to order. They won't be cheap, but they will make bodies able to take standard diameter inserts and springs, or rebuildable coilovers if you want that type.
Unfortunately there will be no cheap/easy solution if spares are no longer mass produced. For me, if I were going to spend on making struts rebuildable I would go for adjustable coilovers. Then there is no need for bespoke "lowering" springs; you can choose suitable rate springs off the shelf and set your ride height and firmness as you wish.
What exactly do people want? If we are looking for a source of strut body conversion parts as offered in the shop, I can probably get them, or even get strut bodies converted, at a reasonable price. If people want coilovers at around £600 a set, I will happily take a couple of struts to AVO and get some made, all they need is a pattern.