The type of change I’m describing to the woodies is something that would improve the comfort of the ride experience without removing the rides’ traditional charm. There are definitely ways in which this can be done, as there have been parks abroad that have proven this.
For example, I know that Roller Coaster at Lagoon received new custom trains from GCI in 2018. That ride was built in 1921, so is older than any of Pleasure Beach’s wooden coasters, and prior to this, the trains were a 3-row PTC affair not dissimilar to the ones currently on Grand National; there are some photos of the previous trains on the ride’s RCDB page:
https://rcdb.com/196.htm
And here’s a video of the new trains, which are slightly modified versions of GCI’s Millennium Flyer trains:
From what I’ve heard, these trains track pretty well on Roller Coaster’s layout, so if combined with some retracking, I think something similar could substantially improve Grand National and/or Big Dipper, in my opinion. Even though it isn’t anywhere near as rough as the above two, even Streak could possibly benefit from this, although as I said, that one is far and away the most comfortable of Blackpool’s larger woodies, in my opinion.
I’m not advocating the removal of the older wooden coasters by any means, but I do think a change like this could really help them to appeal to a wider audience while retaining the rides’ unique charm and heritage. I think something akin to what Lagoon did with Roller Coaster might make the woodies appeal to a wider audience while still pleasing the preservationists; a nice compromise between preservation and evolution, for me.