After clarification with the Proxxon development department, it was confirmed to us that the Proxxon solid carbide end mill set is also suitable for machining titanium.
Milling titanium is particularly difficult. The chips stick to the milling cutter and the formation of built-up edges, which is also known from steel, must be observed. The remedy is to use low cutting angles and special milling materials. (Carbide, cobalt alloys)
Depending on the titanium alloy, the cutting values are 40 to 60 m/min. With titanium it is important to remove the heat, i.e. always use cooling lubricant. Cooling lubricant
Machining aluminium is no problem for the cutters.

with the right drill bits at least for aluminium Proxxon solid carbide end mill set but there are certainly also some for titanium.