How can I update a link template

I posted this in the connectivity forum, but got no response. Does anyone
have a solution to this either Lisp or VBA?
With the following function, I can create a link template

(defun CreateLT (db tbl ltnname catalog schema keylist)
(vl-load-com)
(setq pDoc (vla-get-ActiveDocument (vlax-get-acad-object)))
;get the DBConnect
(setq dbConnect (vla-getinterfaceobject (vlax-get-acad-object)
"CAO.DbConnect.16"))
;get the linktemplates
(setq pLTs(vlax-invoke-method dbConnect "GetLinkTemplates" pDoc))
;prepare the keydescriptions
(setq pKeyDescs (vla-GetInterfaceObject (vlax-get-acad-object)
"CAO.KeyDescriptions.16"))
(foreach x keylist
(vlax-invoke-method pKeyDescs "ADD" x 1 nil nil)
)
;create the link template
(vlax-invoke-method pLTs "ADD" db catalog schema tbl ltname pKeyDescs)
)

With the folowing function I can delete a link template if it has no links
(vlax-invoke-method pLTs "DELETE" ltname)

Is there a function to edit the link template, say to change the catalog or
schema? I know I can do it with MAPPROPSLT
but I need a way to do it from a program.