Do you think that we should not know about or acknowledge that the Lords Prayer is a condensed version of the standing prayer?
The Lord's prayer is the
correct version of the standing prayer. And even in that sense Jesus states "pray
like this" which means it isn't necessary to do so verbatim.
There is no garauntee that the version of the standing prayer you are reading from is actually what was spoken in that time. I think there is good value in comparing Christian customs to cousin religions like modern Judaism, but only with the heaviest of caution that modern Judaism is an antiChrist religion, OT Judaism was not. It is important not to get suckered into the bad doctrine and false historical claims that are present in modern Judaism. There are sprinklings of good things written, much like any pagan religion can have sprinklings of good things. God can speak through many different peoples. That does not make the literature of modern Judaism a safe and idol-free resource to draw upon. Everything should be seen through the lens of the NT, otherwise one gains only a veiled perspective.
If something in the writings of modern Judaism (or alleged 0AD Judaism) resonates with you, follow your heart and mind. Maybe God is speaking through abstract things to say whatever you need to hear. But, be wary of idolizing a culture merely on a claim that they are inheritors of a promise. Especially if your perspective is that those of that culture are just blind to Christ currently, why would you follow the blind when you have the truth in Christ?
Yes, maybe there is something of value that you can draw from the version of the standing prayer you reference, but in a sense only in the same capacity as reading Tarot cards or drawing lots. God will reveal what He needs to reveal to you, and that may be different than what is revealed to someone else (an ear receives messages that an ear needs and a foot receives messages that a foot needs).
Sunlight is the best disinfectant, there should be no issue with reading or observing anything so long as it is consistent with the covenant of Christ. But modern Judaism has become an idol for some Christian believers that can lead people away from the truth, therefore it is prudent to be mindful of this and avoid modern Judaic teachings if you feel the pull of idolatry.