partly necessity and partly one's own choice

[JACEK1]

Hello

The necessity to install the systems is prescribed by the convention on controlling and dealing with ballast waters. This means that all maritime ships will be obliged to dispose of ballast waters by means of using special systems, which leaves ship-owners no option but to have equipment installed aboard their ships in order to comply with requirements of the convention as soon as it enters into force.

As far as the last sentence is concerned, I think there are many ways to express the thought.

I would like you to help me decide which version is the best.

Here is the list of variants made by me.

This means that all maritime ships will be obliged to dispose of ballast waters by means of using special systems, leaving ship-owners no option but to have equipment installed aboard their ships in order to comply with requirements of the convention as soon as it enters into force.

This means that all maritime ships will be obliged to dispose of ballast waters by means of using special systems, which prompts ship-owners to have equipment installed aboard their ships in order to comply with requirements of the convention as soon as it enters into force.

This means that all maritime ships will be obliged to dispose of ballast waters by means of using special systems, prompting ship-owners to have equipment installed aboard their ships in order to comply with requirements of the convention as soon as it enters into force.

This means that all maritime ships will be obliged to dispose of ballast waters by means of using special systems, so ship-owners make up their mind to have equipment installed aboard their ships in order to comply with requirements of the convention as soon as it enters into force.

This means that all maritime ships will be obliged to dispose of ballast waters by means of using special systems, which leads to ship-owners having equipment installed aboard their ships in order to comply with requirements of the convention as soon as it enters into force.

This means that all maritime ships will be obliged to dispose of ballast waters by means of using special systems, which results in ship-owners having equipment installed aboard their ships in order to comply with requirements of the convention as soon as it enters into force.

The bolded fragment in italics indicates the most literal translation that ship-owners decide to have equipment installed aboard their ships because they know that sooner or later they will have to have them them installed, so it is partly necessity and partly their own choice.

What do you think of the bolded part?

Thank you.

 

[Tarheel]

The ships won't be obliged to do anything. The operators of those ships will be obliged to do something.

As for phrases in bold only the first one works for me.