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They likely will not grow roots. You can try, but you will have a better chance of rooting them if you remove the new blossoms.

These plants are notorious for being tempermental when it comes to flowering. They will readily flower for months and then just stop, with no scientific reason for this behavior. Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/flowers/bop/bird-of-paradise-blooms.htm

It sounds like it may be root bound. They like to be a little root bound, but if they get too root bound, they can have trouble taking up water - which would be what is causing the brown tips and stunted growth.

This article will help you with repotting:
https://www.gardeningknowhow.com/houseplants/hpgen/learn-more-about-repotting-houseplants.htm

This is normally caused by a humidity issue. I would increase the water to the plant just a bit to increase humidity. You may also want to try wetting the leaves a bit in the morning (but not in the evening as this can encourage fungus) to raise the humidity.

After repotting, plants will oftentimes experience a period of shock while adjusting to their new environment. The curling inward of the leaves could indicate that the plant is stressed, most likely from the repotting. Make sure that you have given it adequate water and place it in similar light conditions as before.

I think if it is very rootbound, cutting the pot away would be your best option. Do not take the old dirt away from the roots. To decrease the chances of transplant shock, try to disturb the roots as little as possible while transferring to the new pot. There will be some root disturbance, but this is ok. Just try to keep it to a minimum. You can use gravel from outside for drainage.

After you are done, keep an eye out for transplant shock. This article will help with that:
https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm