Haha indeed. Well played. Timing belt and standard maintenance items have all been widely covered in 20 years. If you’ve tackled all those jobs you won’t have any problem finding exactly what you want and need to fix on that car. EJ22s are simple reliable and well known by Subaru experts and hobbyists.
The one surprise might be knock sensors - the material degrades over time and cracks, typically unseen at the base where it interfaces the engine. One 12mm bolt and easily replaced in 15 minutes. 30-45 maybe for a first timer. I routinely replace them preventively because the eBay specials are cheap and it’s easy.
The hardest parts to replace are alternator, starter and fuel pump, they are notably inferior from aftermarket and OEM is no longer available or $$$$. Aftermarket electric motors of any brand or warranty flavor are always more problematic than OEM. Install 50 of them and I guarantee you’d be shocked at the reliability, breaks downs and getting stranded. Subaru had $80 reman alternators but they may be NLA.
I drive to Mt Katahdin in Maine, snorkeling off Looe Key in Key West last year, 10,000 feet in Colorado in August, and routinely well over 200,000 miles as well as help dozens or maybe hundreds of other people with Subarus over the last few decades.
It youre just beating around locally and only putting a few thousand miles on then you’re chances of issues with aftermarket are lower. I want like new reliability and so far have gotten it and while seeing lots of other people struggle with issues I’m usually help him them resolve.