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with how much fabrication you've gone through.... you could consider a new intake manifold, one with split intake runners that would allow you to shut off all flow of air to one of two intake valves while under x RPM via throttle plates, then open up the entire air path above x RPM. should have a negligible effect on high RPM power if calculated/designed correctly while giving you at least the same improvement that actually disabling an intake lifter gives.
the only significant complication with this is going to be dependant on how the intake port runs in your head..... if the port is already split in two at the head, that simplifies things quite a bit, if not, then you would need to split them yourself via welding in a small divider, which is tricky.... to say the least.
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