Hack to attach front bag to e bike?

I have a lovely front satchel bag and an additional block because I didn't do my research properly and didn't realise my battery uses up the front clamp position.

Does anybody have any suggestions, ideally for adapting the kit I already have (additional front block and matching front bag) so I can attach them to my Brompton please? Budget hacks particularly welcome.

I don't currently have any additional bags anywhere on the bike so handlebars, seat post etc are all available, just not the front clamp with battery.