Agree with most of what jamesbrown has said in this thread.
If you are indeed going to a country where there's zero tax on dividends (do triple check this as you misunderstanding things here could be a very expensive mistake to make), then potentially you could forget the MVL, just take all as dividends once you're confident your tax residency is the new place. You do also need to ensure you don't return to the UK for >5 years.
Otherwise, an MVL likely could be a good option for you. Whilst I agree the deliberate investments aren't going to help your case with regards to ER, it sounds like it's only ~10% of your assets, and income from it has been trivial. Also I'm assuming there's been negligible expenditure directly related to it, nor have you spent that much time on the investment side (relative to trading). Therefore on balance you're likely to still pass the majority of the 20% tests.
The reality is pretty much every single ex contracting company going through MVL Online will have had a cash balance well in excess of their working capital needs. Ie even if just sitting in a deposit account, it could be considered an investment asset rather than a trading one. However, that still means whilst maybe one of the 20% tests is failed, the others are almost always still passed with flying colours.
See here for further info on that.