'Tis a tale often told, I'm afraid, Ian.

My suggestion here is that you consider coming to an arrangement with an independent service provider here in the UK who would be willing to send stuff out to you on a regular (or even, as and when) basis.
Can we assume no special problems where you are with stuff coming in (mail, "DHL"*, air-freight
etc.)?
If you want to PM me, I can give you the contact details of a company whom I happen to know has interest in, shall we say,
partnering with biomeds outside of the UK. Not only parts in fact, but tech (and, I dare say,
moral) support in general.
*
Other international couriers may be available!