Please, give ideas regarding saddle!

Sitting on a home trainer is somewhat different to riding outdoors. I've been happy for hours on most saddles I've ever tried outside but 1.5hours is about my limit indoors. Outside, you might not feel it or be making conscious judgements but you're moving the bike beneath you, adjusting for corners, potholes, gear changes etc. These micro adjustments make a saddle a different proposition outside compared to indoors where you are likely sat in the same position most of the time. Yeah you might shuffle a little or stand up occasionally but it's not the same. The saddle I use on bikes outdoors I don't think I would want to use indoors. I have a slightly more padded one with a cut out indoors.

I think trying them on the static bike first will lead to you discounting a lot of saddles that would be very good outside.

I think you need to keep searching, try some different brands.   Completely different shape and rider to you but I know from experience Selle Italia havent yet made a saddle that works for me whereas my ass can work with nearly everything else.

Have a bit of an ebay frenzy on used/tatty versions of 2-3 different brands then re-Ebay anything thats not nice for your butt, and get a new version of whatever works.   Don't worry about going for the high end versions as they generally lose weight via less padding and different rail material.   Just get the bog standard cromo ones and upgrade if wanted later.

The clue is in the name - it's a saddle, not a seat. If you're sittting in the same position without moving then all the pressure is going to be taken by the same points in your backside and the nerves are going to start to tell you that you need to move.   Alternatively, you need a seat that spreads the load and allows you to sit in the same position for longer.  It might look like this:

https://www.123rf.com/photo_23309251_red-round-vintage-tractor-seat.html

2 hours sat in the same position?

That must be boring.

I find I can sit on most saddles regardless of sit bones due to spending lots of time fidgeting about on my ride. So, I'll be more on the nose of the saddle when climbing, or stood up, but as far back as I can get when descending.

I think your problem is exacerbated by doing specific indoor cycling and whatever saddle you choose now might not be the saddle you need once you are back outdoors.

If your focus is currently on indoor training, and you're looking to do TT-like efforts maybe consider a TT specific saddle? My understanding is that they promote/allow a much more aggressive position compared to a 'standard' road saddle.

If you sit in your favourite armchair for 2 hours it will feel bloody uncomfortable. Are you looking after the basics like making sure you do out of saddle/stretches regularly? If you do group rides and sit in for a while it is amazing how much the average rider fidgets around, which helps to alleviate the pressure naturally. Turbo sessions can end up as a 2 hour slump, which few saddle/short combos can cope with.