Hi Rien, The first judgement is whether the deep diver has merit better than another investment.
After that determination has been made, if one wanted to re-start the AIM process of compounding LIFO gains by selling some portion of the portfolio and reducing Portfolio Control by that amount, it certainly would get some activity sooner.
I think it was Keith (Lemonhead) that talked about this back in 2000 initially. I poo-poo'd the idea saying that creating a situation where one sells a substantial portion of the portfolio at a loss makes it difficult to return to profitability. I suggested selling all or just patience. It would seem that patience is wearing quite thin these days!
One needs to determine if the investment is salvageable or "beyond salvage."