If one throws out dispensational beliefs as heresy, then reformed theology also gets thrown out as heresy, because dispensational soteriology is based upon reformed soteriological doctrine.
If reformed soteriological doctrine is thrown out as heresy for not placing the Catholic Church first, then Catholic doctrine is heretical for placing faith in authority and power prior to faith alone in Christ alone.
On the other hand, it is possible to be a believer in Christ, part of the body of Christ, by thinking in belief through faith in Christ, in any environment, and still build doctrine upon doctrine by remaining faithful through Him in what He provides.
If one throws out dispensational beliefs as heresy, then reformed theology also gets thrown out as heresy, because dispensational soteriology is based upon reformed soteriological doctrine.
Can you please explicate dispensational soteriology.
What I see, and don't take this the wrong way, is dispensationalists finding it necessary to say some very odd things about salvation in order to preserve the distinctives of their system.
For no particularly good reason other than to preserve the Church/Israel distinction, the whole thing becomes a complicated Rube Goldberg machine. That's not a good sign.