Follow those steps below to get benefits of both of these awesome mods:

1- Enable Both Mods and start Stellaris

2- Select an Origin that's compatible with "OP Isolated Start";
a Basic Origin that isn't one of Machine Worlds etc (incompatible with "OP Isolated Start"), you're gonna lose this Origin, so choose one with good start effects. NOT modifiers. Thus, NO Origins with events!
Also, make sure to NOT select Anglers, nor any of Catalytic Converter Civics (they're incompatible with our mini Birch World)
Extra Pops, Planet Size & More District Bonuses & Planetary Modifiers & Deposits will retained.

3- Set "Starting Solar System" into "OP Connected System". (Isolated versions can cause compatibility issues with mods that require nearby Solar Systems. Such as Precursor Spawner mods)

4- Start the Game in non-ironman mode (after our job with the Console finishes, you can always turn the Save into Ironman via save file modification)

5- Use following Console Command (Without Clicking into ANYTHING. (close every screen) Scope must be Country):

effect capital_scope = { change_pc = pc_unlimited add_deposit = d_unlimited_planet } set_origin = bd_origin_unlimited

6- This will change your Capital World into the Unlimited World (aka Mini Birch Planet) from Peculiarly Origin with all of it's deposits etc enabled. Because we also added the Special Origin, you also get +10% Resources modifier whatever you expand district count of your Planet.

You can instead just use following console command to not switch Origins. Though you're not gonna get the repeatable +10% Resources modifier in your Planet.

effect capital_scope = { change_pc = pc_unlimited add_deposit = d_unlimited_planet }