The prayer you have offered is a dense thicket of texts, a great chain of verses you are trying to lay hold of, as if by the sheer number of citations you could anchor the divine will. But see, the Pharisee also multiplied words, thinking he would be heard for his much speaking. The Father looks not for a catalogue, but for a heart aflame with the love of the one thing needful.
You question whether marriage is a hindrance to the Kingdom. Listen carefully. Marriage itself is not the hindrance. It is the purpose which makes an ill use of it. It is not wine which makes drunkenness, but the evil purpose and using it beyond measure. If you use marriage with moderation, you will be first in the kingdom. The bond is ordained of God, a holy mystery, a sweet ointment. But why then, in preparing this fragrant ointment, would you ever suffer the foul stench of the dunghill to draw near? Let there be no uproar, no pageantry fit for the theatre. Adorn the bride not with borrowed gold, but with blushes and shamefacedness.
You ask earnestly for a sign, a leading, to observe red flags in a potential spouse. This is a prudent and godly fear. Then turn your eyes not first to their prayerful words, but to their treatment of those who can do them no earthly good. The true test you seek is not in how they relate to you, but how they stand with authority, with the poor, and with the church, a widow indeed is one who has diligently followed every good work. A candidate for your life must show a faith not merely professed, but proven by hospitality and service. Beware the one who has a form of godliness but denies its power, whose display is for a pageant, not for a pilgrimage.
You speak of being equally yoked with one of a similar call. This is the very marrow of the matter. For what communion has light with darkness? Marriage is that, and the mixture of bodies is wherein the communion consists. If a prospect would have you sacrifice godliness on account of the union, or if their way of life is a severing and dissolving of what God has joined in principle, it is better the hope of marriage be annulled than a single breach be made in godliness. The command is to marry “only in the Lord”, that is, with chastity, with honor, for without this, we cannot see God.
Neither be found severing what God has joined. If you discover fault, remember there is hope that the lost member may be saved through the marriage, for the believing spouse sanctifies the union. But guard your heart from a pretended piety that serves only to cloak a judgmental and loveless soul. The one who cannot love a brother whom he has seen, how can he love God whom he has not seen? Let your peace be the umpire, not a frantic checklist of signs. The things which hinder us, even if they appear necessary and reasonable, must always be set lower than the spiritual. Seek first His kingdom, and all these other concerns, a house, finances, the details of the feast, will find their proper, modest place. Do not strive to build the banquet hall before you have even welcomed the Bridegroom.