DSM is good for attaching moss to wood permanently without it detaching itself in time. Other than that, I'd use the time and patience to grow the plants under water, where they can adapt to permanent conditions. If you are going to have soil in the bottom layer of the substrate, provided you do it right, the plants will explode in a month or two. I'd would do no ferts of any kind for at least 6 months, then dose lightly. A bit of co2, and flow around the tank would keep the system happy for years to come. There will be problems eventually, but if done right you shouldn't have any issues in a good while. Immediate issues means the tank is not set up right in the first place, e.g. anaerobic substrate, lack of oxygen, not enough light/too much light, etc...I was able to sustain a completely algae free soil tank for about 3 years until I overstocked it. I never even needed to clean the glass in that period. So it's achievable. More is not better and patience is a virtue.
And I am sure you know what you are doing but learn your plants requirements along the way.
Be ready to move plants species around and see where they like it best in your tank. Plant same species of plants in totally different spots around, darker and brighter, more flow, less flow, etc... That's how you get the best outcome and you also learn what the plants you specifically planted in your tank want. Its the same as learning fish requirements.
