Yes it was also a disclaimer on the designspark main page from RS components...
"Clarification: the paid add-ons do not provide AutoCAD DXF or DWG import capability"
https://www.rs-online.com/designspark/introducing-the-new-designspark-mechanical-add-on-modules

The " text point file" import looked interesting but I'm not faffing about with yet another workaround,
for what should be a simple 2d 》3d workflow ( I think moi is going to do fine :0)

https://designspark.zendesk.com/hc/en-us/articles/360022341474-How-do-I-format-a-point-curve-text-txt-file-for-import-
https://designspark.zendesk.com/hc/en-us/community/posts/211756129-DXF-Import