Keeping shadows and chart styles when exporting to PowerPoint

Hi! Sorry for the long post, the TLDR is:

"What are your tips & tricks to cope with the limitations and errors of Keynote to PPTX conversion?"

More specifically:

We regularly create Keynote presentations with a lot of charts and shaded boxes, which we need to convert to PowerPoint when delivering the final deck to our clients. Using Keynote is a godsend as productivity speed is far, far superior to what we could achieve with Powerpoint, and the results are visually so much better even with minimal effort.

However, when exporting to PowerPoint we encounter the following key issues (among other smaller ones):

• Contact shadows and Curved shadows are converted into a very ugly standard drop shadow
• Chart axis values on standard box plots are positioned on top rather than on the bottom of the chart (the axis line and ticks remain on the bottom)
• Duration and Custom format displays for chart values are converted to random formats
• Text objects inside a group are often shrunk to a couple of pixel-high boxes

The problem here is that the changes make the presentation not client-ready, thus forcing us to do further work before being able to deliver the product.

We can avoid this by doing the following:

• Never use Curved or Contact shadows
• Remove axis values
• Never use custom or duration formats
• Ungroup all object groups containing texts prior to exporting

As you can imagine this is less than satisfactory. If we want to retain the visual quality of the source presentation, we need to manually go through the newly converted powerpoint and adjust manually the results. (One solution, for instance, is to copy and paste directly from Keynote to PowerPoint the Boxes with Curved or Contact Shadows : they are converted to raster images that can then be manually placed instead of the badly converted ones). But this generates additional costs at the end of a project as we need a competent technical person to spend one hour or more on correcting the final conversion.

Some of the issues listed are clearly bugs (e.g. Badly resized texts inside objects groups, chart axes getting displaced), but others are tied to PowerPoints' lack of support for comparable features (e.g. Curved shadows, custom formats on charts). I know the Keynote dev team has a very big list of things to fix (as a programmer I understand your pain) and some of them have more priority than others, so my question is not about that.

My question is:

• Do you have some workarounds that you use when you have this kind of issues?
• Are there other tools that you know of that can fix some of these?

As said, our current options are to degrade the quality of the presentation beforehand, or to spend time checking each slide and manually adjusting the final document.

Thank you both for reading all this and for any ideas, tips & fixes you might share!

Basilio