This might work......... **disclaimer** ...this was a trick we used back in the day....the Paioli parts blowups I have seen look just like a 1980's Honda fork inside..........but I have not tried it on my Scorpa .....*****
If you 'slide hammer' an excessively tight seal out, you risk damaging the bushing or washer since you are hammering the bushing against a washer against the seal...what we would do for the really tight ones was remove the springs, compress the leg within a couple of inches of bottoming out, then totally fill the fork with oil [any kind of oil] and install the cap, leaving no air bubbles inside. Then stand it in the shop's hydraulic press, and push down until the seal is 'hydraulically' forced out of the leg by oil pressure. No chance of any damage, but it can be messy. As long as there is no air in the leg, the seal will slowly move upward without blowing out. Once the seal is broken loose you can dump the oil and lightly hammer it out as usual.
hope this helps