GS63

First post here. I generally like Affinity Designer but I sooo miss Illustrator's Offset tool. I use vector apps to lay out cutlines ( full size working drawings ) for stained glass windows. I'm currently doing layout for an 8 x 3.5 metre west window with 19 individual lights all of which require borders offset from their outer edges. I'm struggling with the Layer ▸ Expand - Layer ▸ Geometry ▸ Divide workaround. It's proving very flakey on a project of this size. Offset please.