I’d say - if you moor in Funchal - just go the Blandys. Take the tours if you have the time, if not you can still taste Madeira including older ones there. Cost of tasting is deducted from any purchases.
Although I made an online booking for the vintage tour on their website when I got there in June they admitted that the online booking wasn’t working - they seemed to have no idea when or if it would be fixed. We were signed up for the vintage tour there and then.
The Madeira Wine Museum was closed for renovation with no indication when it’d reopen.