Problem with overseas ETFs is that as collective investment schemes (CIS) they need to be UCITS compliant, non-EU ETFs are typically not.
Specific to the uranium sector, I am put off ETFs here as there is a fair amount of junk out there. So would rather concentrate my picks across companies with quality management, permitted access to good geologies and sound balance sheets.
I am very fond of ETFs and they constitute the bulk of my portfolio ~90%. However, in this very particular instance I believe there is a better way to fulfil the exposure profile I want.
PS. If you did want access to US ETFs one strategy is to buy a 1x levered CFD (ie. an unleveraged CFD) through a CFD trading platform.