I actually don't think there's much value in 1-2m seller spinoffs given ever-increasing production costs. Better to take their time and go for stuff that could sell 5m+.
They'd be better served by creating more major pillars in the vein of TCGPocket and integrating them with Home and the mainline game ecosystem. For example:
-Integrate TCGPocket with Home by e.g. introducing some kind of currency that can be used to transfer a card to Home for use in other games (card versions of Pokemon could maybe bring some kind of unique moves or cosmetic differences to make them appealing)
-Release a native Switch 1/2 app for TCGPocket
-Build an official version of the fanmade battle simulators like e.g. Pokemon Showdown with Home integration. In other words a platform where you can battle vs other players/bots on mobile/Switch 2 with your Home synced Pokemon. Completely detaches and protects the competitive/ranked element from Pokedex/production-related issues in the mainline series, and lets them operate multiple rulesets independent of anything going on in the mainline series (opens up special event rulesets, return of previous generation mechanics, etc)
With an arrangement like the above there is far less pressure to rush out smaller titles, themed expansions and content releases for these games would reach many more users and tie into the other pillars of the franchise better than stuff like Detective Pikachu Returns.
Ideally they'd also get Pokemon Works to the level where their output is indistinguishable from GF's mainline titles, even if it's on a slower schedule. For example if Game Freak want to continue delivering 2 mainline games per generation (alongside 1-2 Legends games) then PW should at least be putting out 1 substantive remake per generation in between. I think they will permanently sour people on remakes if the production value is always far behind the mainline entries, and frankly the DP remakes were a waste of the production capability we've seen elsewhere from ILCA.