First of all, excuse me for my english... I don't practice much...
I don't know about the ASV, but I've tried to fit a Sunline ARC unbreakable lever for KTM that works the same way as ASV, but I didn't succed becouse I ended up braking the lever by modifiing it too much.
I found two problems that can easily be solved... but it was too late when I realized.
The fisrt one is that the tiny cilindrical piece in the lever that pushes in the master is in a diferent height (lower in the GG) but that can be easily modified.
The second problem is more dificult for me to explain... I'll put a picture of a friend that has done it the easy way. You have to modify the AJP master by polishing the ends that hold the lever so they won't touch with the lever where it gets thicker (the joint)... i didn't want to modify the Master but the lever and I dumped $60...
I dont like the way the 1st problem is solved in the picture... with a shorter piece that pushes the master, there is no need to getting rid of the dust cap of the master
About the second problem, maybe other unbrekable levers may have more lenght between the whole for the screw that fixes it to the master, and the joint of the flexible part of the lever... if you finde the brand or mdel... please let me know... I hate having people to wait me while changing the lever... unfortunately I fall to often
Hope I explained clearly enough... but if I haven't... let me know... I'll try to put more pictures and explanations