Hello everyone! In case someone is still looking for C25953 replacement in GAL please check my latest work: https://github.com/mikulski-lab/C25953-emmu/
It fully replicates C25953 so no external latch (74LS95) is required. The drawback is that is not fully 1:1 pin compatible, however if you go with GAL22v10 only a few wire bridges are required on top of the IC so it can be directly inserted into the IC socket on a motherboard.