How do you Import PFX file using iControl with Powershell?

Using 11.4.1, how do I import a pfx file using iControl/Powershell. In the UI, I navigate to System --> File Management --> SSL Certificate List. Click Import, change the "Import Type" drop down to PKCS 12 (IIS), enter a label for my cert in Certificate (ie: testCert), use "Choose File" to navigate to where I've stored the PFX and select the PFX. Enter the password needed by the PFX file (ie: testpassword) and click import.

I see under icontrol there is a ManagementKeyCertificate.pkcs12_import_from_file and ManagementKeyCertificate.pkcs12_import_from_file_v2

v2 is for 11.5 and above. It doesn't work on 11.4. So just ManagementKeyCertificate.pkcs12_import_from_file

I look up the overloads for this and it seems fairly straightforward: void pkcs12_import_from_file(iControl.ManagementKeyCertificateManagementModeType mode, string[] ids, string[] file_names, string[] passwords, bool overwrite)

which I translate to

$icontrol.ManagementKeyCertificate.pkcs12_import_from_file(0,@(,"testCert"),@(,"c:\temp\testCert.pfx"),@("testPassword"),$false)

which blows up with Invalid filename. Filenames may only contain the following characters: [A-Za-z][0-9].-_/"

so I try variations on the filename including setting my location to c:\temp and trying

$icontrol.ManagementKeyCertificate.pkcs12_import_from_file(0,@(,"testCert"),@(,"testCert.pfx"),@("testPassword"),$false)

and

$icontrol.ManagementKeyCertificate.pkcs12_import_from_file(0,@(,"testCert"),@(,"/temp/testCert.pfx"),@("testPassword"),$false)

sooo...... I guess the crux of my problem is: How do I specify where the pfx to import is located? I've seen a couple other questions with this same problem but they don't have answers... so here's my hat in the ring