My only experiences were with a late 70’s Stamped T top and a Pat Sticker set. Both of which had made their way into the bridge of my Page and matched with the Page bucker A3 neck. Pat sticker was smooth, very good. I had better sonic results with the stamped T top. perhaps it was just the right combination but it god some awesome middle position tones. Through a Marshall 1959HW it was glorious.
In your place I would definitely not modify the original pups in any way, especially if you think you might possibly sell the guitar some day. I would try a set of guitar fetish pups and put my t-tops safely away for posterity. I would also save any other original parts like caps and pots if they were in working order. If you want more balls and a deeper tone try a set of gf fat pats. If it is a more modern, cutting sound there are ceramic gfetish crunchy pats. These are surprisingly good pickups for the money, and might bring your old guitar a new lease on life. Bear in mind, I am not telling you what you SHOULD do, only saying what I would do in your situation.