Actually this question bothers you, isn't it?
"What, when I do it, will lead to long-term welfare and happiness?"
Personally I don't give much value in practices aside of what the Buddha taught and later developments, but if it really leads to a better, then stay with it. If you gain more faith is Buddhas original and down-to-earth practice, it's no problem to change. But, as also in the time of the Buddha, once a follower of other sects requested the refuge in Buddha, Dhamma, Sangha and the going forth, Buddha told him to wait a certain time, to get ride of the old "stuff" and than simply stick to the new. So from my opinion, its no problem to change, but for sure a problem to mix things, especially if one has no perfection in either practice.
As a layperson, don't forget to straighten virtue and generosity, as it is really not seldom that people train the
Upasatha of the jains, doing there practice and hope for a better. Buddha called such actually "thief". So stay as good as possible on earth.
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I have got an email form "donations[at]vipassanaforum.net" and I really don't know what to do with it. There was a quote of the Sutta above "Precept & Practice" and then the question:
"Do you mean to say that only Vipasanna is THE PATH

Rest all does nt lead us to Liberation?"
Actually I am not sure if the sutta was really read. As for the path of liberation, there is the Eightfold path and all what is in the frame of it, will lead. That's the promise of the Buddha. Not a 2-fold, not a 7-fold, not a new path, but this.
We would need to clarify what Vipassana means for you. If it means "only by actally gaining insight and knowledge" you can gain liberation: Yes. If it is meant as "Pratice & precepts", see sutta above.
I hope I could answer this question via email and think it is really better to stay in the forum, personal I don't really like PMs and all that other stuff, here more public, we can correct our views to right view much better and there is no danger that stuff get's around unproved by others. But that is just my opinion. Hope this is not wrong understood.
metta & mudita
Johann