You can do a lot better than DiveMASTER. In PADI terms it’s a glorified shop assistant and dive guide.
Technical diving is where the skills are. Deeper, longer, further, all need skills way above those of DiveMASTERs.
In any case keep at the basic courses, go diving and practice as much as you can. Getting to Rescue Diver is a good target and then decide where your diving future goes.
The problem is you are talking apples and oranges.
Being capable of doing a mixed gas dive is different skill set to what a Dive Master requires. The objectives are different. There are complimentary skills. Good buoyancy skills, good diving techniques etc.
In truth most of the time you spend when teaching a 'technical course' is spent teaching people to improve what should be basic diving skills. The 'technical part' is quite a short part of the course. Most people who fail 'technical qualifications fail because of 'diving skill' failures, not the stuff about mixed gas and decompression theory.
Buoyancy - Diving Skill
Fining (backwards, helicopter turns, flutter kicks, etc) - Diving skill
Buoyancy stop - diving skill
Confidant mask clearing, regulator switching, AAS, CBL etc - diving skill
They apply in 10m of water and 100m. If you are on air, or Helium.
In truth - the 'technical' bit is understanding the gas, and the decompression. A lot of this is easier now than in the past, rather than cutting tables, determining your gases etc. There are computers doing this for you and in some agencies prescriptive gases to use.
A lot of 'professional' divemasters are managing groups of people. If you are on a live aboard, the divemaster is co-ordinating the crew, the customers, the equipment, doing site briefing and safety checks. Their diving skills are excellent.
But then they are not zero to hero types.
I've dived with a lot of 'technical qualified divers' , who struggle to manage themselves, let alone 12 or 20 divers.
Look at some of the CMAS and BSAC courses. There is a point where the 'diving' skill element is basically assumed and just assessed. The big element of the course is the expedition management, planing and rescue co-ordination.
Gareth