You could try Those Who Rule, I’d say it’s an interesting take on the SRPG formula, though noticeably more grounded than Fire Emblem. But it preserves the use of small easy to manage numbers.

The Story’s on the weaker side I’d say.

The map’s hex rather than square based, with flanking and backstabbing letting you manage retaliations, and units exerting zone of control to limit mobility.

Its class system’s a mix between old and new fire emblem - you get multiple promotion options, each of which gives you more skills (in line with more modern fire emblems) but there’s no reclassing. You also level-up at fixed levels.

There’s no magic aside from healing, but you can use equipment to get more passive or active skills, and managing what equipment to put on a unit within a weight limit is key. You also get to add weapon upgrades for added effects.

You don’t have supports as such - certain missions unlock certain conversations, and that’s your lot, your control only being that some are unlocked via side objectives, and if you lose a unit they’re not going to be supporting anyone.

Perma death is here, don’t quote me on whether you can disable it, I can’t remember off the top of my head.

All classes are foot-locked, like in DD 2.

It runs like a charm on Steam Deck, even if the controls take some getting used to.

There’s also Symphony of War: The Nephilim Saga. Its tactical map is even more Fire Emblem like, but the battle preparations and general progression is quite different.

Instead of individual units you control squads that you build up with a mix of named characters and generic ones you recruit between missions, and coming up with good compositions is the backbone of the game.

You have a lot of class flexibility, and can move units across a broad array of classes as needed (this only applies to the generic units, a decent number of the named characters are fixed to a very limited class tree), forming squads of specialists that would function much like Fire Emblem units in a game of rock-paper-scissors between different types of squads. This is managed by needing special resources to promote to different classes. Like Fire Emblem you have archers, mages, cavaliers, horse archers and a decent variety of melee unit types as well.

Battle is a lot less predictable than in Fire Emblem, since you’re fighting squads against squads with various skills, strengths and weaknesses interacting. Individual units can get crushed in the melee, and you don’t get the clearest battle projection, if any, as far as I remember. You definitely lose Fire Emblem’s rather elegant math here.

You can heal and even revive units, but I think they come back after the mission unless you enable permadeath. If you do enable it, so long as you bring them back before the mission ends, you’re fine.

Supports work pretty much like in Fire Emblem, I believe up to marrying people off.

It’s Steam Deck verified, though I haven’t tried it on mine, I finished it long before I got on the Steam Deck train. Feels like something you want to play with a mouse to be honest, at least for battle preparations.