developing new technology

This isn't as hard as you want to believe, nor would it require a brand new ship. If you want to do coastal designs, there are already some in place. If you want data sovereignty, the only real benefit of space data centers, a small cargo vessel with container data centers and one or more onboard generators could do this. Fueling it would be a challenge, but no more than all the issues with a space data center. As for time constraints, this would still be faster to deploy than any space-based solution.

None of this makes it a good idea, just not particularly novel, difficult, or time-consuming.