1: My suggested method works without issue
The step I glossed over: You would then drag the png back into your SVG drawing. This will embed the PNG into your SVG. Sorry, I left it off because I figured you knew how to do this already. Once embedded, you can align it with your existing rectangle/any other cuts you wanted.
2: Making a bitmap copy has one negative you should know
Make a bitmap copy gives you no (simple) control over DPI, it defaults to 96. This will seem pretty jagged in an engrave on all but the lowest LPI settings.
Luckily, you can change the default DPI.
- go to Edit->Preferences
- scroll down to the Bitmaps section
- change the default “Create” DPI
3: Bitmaps aren’t as capable as PNGs
Also as a rasterized image, a bitmap will not support transparency, which may be something you want later when engraving.
4: PNG export gives you a static copy of your raster
If you save it out as a PNG, you can do post processing in GIMP/photoshop/etc to get it exactly right before importing back into your SVG. This won’t always be necessary, but if you get into serious fiddly tweaking, this is the way to do it.
So for quick and dirty, yeah that make bitmap copy works well enough. I'd just up the DPI before you export a bitmap copy. Exporting the PNG is the more thorough way to do it and may be a welcome part of your workflow to have separate asset files for later adjustment.