I understand the desire to continue using a valued piece of legacy equipment but as years pass the balance between practicality and nostalgia shifts relentlessly towards the latter.
I never owned an SW1000 (I assume you're referring to the SW1000XG or something like it?) but a read through Martin Walker's review from 1998 portrays a card which for the time was very good indeed but which has since been overtaken.
Assuming I've got the model right I note it supports some PLG daughterboard cards. I have a couple of PLG expansions installed in my venerable Motif XS7 which I like a lot and use to this day but to be honest the prospect of creating a new set of Win 10/11 drivers for a legacy PCI soundcard without support from Yamaha is pretty unrealistic.
Even if I owned one I would be unwilling to punt money on a third party trying to implement something that would work on a modern computer. In the event they succeeded in hacking something together it could break at any time with future Windows updates and life's too short for that kind of ongoing hassle.
My recommendation would be to find something modern that you like as much as you like the SW1000 and look forwards as opposed to backwards. It's for this reason that I prefer standalone hardware devices to anything reliant on a computer. Synths I bought decades ago still sound as good as they ever did even though they are ancient history to the manufacturer.
I'd replace the SW1000 with a modern audio interface (plus a MIDI interface if the replacement doesn't have one), second-hand legacy hardware if you want 'that sound', and/or a modern synth to get similar results with a better feature set.