Starting a business you need to spend on what equipment that gets the product out the door. Convenience things like dust collection would be way down on my list. Brooms are cheap.
If you are exposed to fine dust for an extended period, you will suffer health issues. I did not see a shop vac on the list of the tools already owned, so even a decent shop vac will help. Even rattle can spraying in a confined space can give you a congested throat.... DAMHIKT. Dust masks and proper air filtration gear would be a wise investment. All the production increases won't matter a lick, if you are sick.
Box fans and taped on furnace filters are the cheapest air filtration you can get. Shop vacs connected right to the source are second. A full blown DC system is expensive, but most "serious" wood shops have them. I have 2 mobile Jet units I swap around to the jointer, table saws, planers and drum sanders in my shop. I have 4 Rigid shop vacs that are connected to the RAS, Bandsaws, router tables and one just for floors and hand held sanders. They were about $50.00 each on sale at Home Depot in the fall.
My "small" air compressor is a Harbor Fright 2 HP on sale for about $120.00. It will drive brads and nails and spray clear finishes on small projects with a HVLP gun. I also have a roof mounted exhaust fan to clear the shop of any airborne pollutants, about $70.00 at Home Depot if I recall. It could also go through a hole in a wall rather than tear off shingles on the roof.
So, for under $500.00 you can greatly improve both the safety and production aspects. As far as the Domino loose tenons go, I use a dedicated hand held router in a self centering jig to make mortises for furniture, total cost under $200.00, much less than the Festool unit. You can use it for dowels with the proper size bit. Just plunge down a perfectly centered hole on your workpieces.
If you don't have an outfeed table on your table saw, make one ASAP. It is probably the most important safety accessory you can add to the table saw. It will support your workpiece and the cut off and prevent you from reach around or over a spinning saw blade!
Struggling to support your workpices is not a good idea if they are large, long or heavy!