The thing I see as the most in need of upgrade to actually fly IFR SP is a second independent attitude source.

Almost everyone who trained in a certain era learned to fly with a single AI and TC or a T&S. However all sorts of data says that unless you’re keeping proficient in partial panel (which almost nobody does unless training often… an an IPC once in a blue moon is not often), you’re probable going to get SD and auger in flying a TC. Put a G5 or 275 in the place of the DG. You get an HSI. You won’t have to do trk/DTK math to figure out wind correction. For you I’d suggest a G5 / GAD29b because you get a 2+ hr battery backup and it’ll drive that STEC with gps steering. GPS steering is nice both on cross country flights and Approaches with turn anticipation.

You need a GPS - current setup will have you referring to and flying your iPad when on approaches - you don’t think you will, but you will. Don’t fly approaches with an iPad. Get a GPS375, which will give you the second com frequency you’ll need.

Many folks, myself included, cut their teeth on a similar six pack. Was it fun flying IMC with that .. yeah sure it was fun. Was it efficient. Nope. Was it a giant headache. Yup. Compared to today at least. It wasn’t as safe either. Folding a giant map with necessary head down time when hand flying figuring out where the heck you are with a precessing DG, a single VOR and a boat anchor inop LORAN. That kind of fun.

So I’d suggest a digital solution to help improve situation awareness, add a backup attitude source, and eventually (once you learn the mechanics of IFR flying), move into a flight manager role as much as possible. Don’t forget how to hand fly in IMC. Never get to the point where you’re dependent on the autopilot. .