I've actually kept a few similar nano tank setups like yours over the past few years... even the tank, filter, light and soil also exactly the same.
The setup definitely can grow a monte carlo carpet, those are relatively easy plants to grow so the Z-Series LED light is more than sufficient. Going by the DSM route will greatly accelerate the plant growth, so its a good move, just make sure to keep the plants hydrated by performing regular misting in small amounts (but not too much until its water logged).
If you want to also grow weeping moss on driftwood in the same tank, then you will need to cover it and mist more often to retain the much higher humidity conditions. The monte carlo can dry out between mistings without issues, but the moss cannot be allowed to dry out, so you need to cater for the moss.
After you flood the tank, if you are not injecting any Co2, its still okay, just that the overall plant growth will naturally slow down according to the limitation in carbon availability. You will also need to reduce the light photo-period to match the reduction in carbon supply too (otherwise very easy for algae to take over). There may be some melting due to the transition from emersed to submersed forms for the plants, but once everything transitions properly and is stable, the plant growth should maintain at a steady (but slower) pace.
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