There are other ways to get IR hours under my point of view. Part time cargo, corporate, air taxi, and ferrying ac to name a few.
There are a number of pilots that fly often GA under IMC and have under their shoulders a great experience.
There are many retired airline pilots that continue sharing their experience as FI.
If you are in the FI/CRI business you will grow with time, you will be able to jump to the next level by gaining the experience as you will get opportunities with time. If you are airline experienced is great however whoever is doing this, needs to consider that it should not be any shortcut.
While you are doing well and experienced in the IFR world you may be lacking in the teaching side, in the piston world, and your self motivation.
The rules are there for a reason.
I would even make them tougher if I could.
200 hours is a base.