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Define R2 as a multivariate polynomial ring in 1 variable:

sage: R2.<z> = PolynomialRing(QQ, 1)
sage: Q = z + 5
sage: for c,t in Q: print c,t
1 z
5 1

This ring (and its elements) will have different methods than the ordinary univariate ring (elements).

Alternatively: keep your original ring, define R3 = PolynomialRing(QQ, 1, name='z') and use R3(Q).

Define R2 as a multivariate polynomial ring in 1 variable:

sage: R2.<z> = PolynomialRing(QQ, 1)
sage: Q = z + 5
sage: for c,t in Q: print c,t
1 z
5 1

This ring (and its elements) will have different methods than the ordinary univariate ring (elements).

Alternatively: keep your original ring, define R3 = PolynomialRing(QQ, 1, name='z') and use R3(Q).

def to_multivariate_poly(expr, base_ring):
    vars = expr.variables()
    if len(vars) == 0:
        vars = ['x']
    R = PolynomialRing(base_ring, len(vars), names=vars)
    return R(expr)

sage: x,y,z = var('x,y,z')
sage: P = to_multivariate_poly(x + 2*y + x*y + 3, QQ)
sage: for c,t in P: print c,t
1 x*y
1 x
2 y
3 1
sage: Q = to_multivariate_poly(z + 5, QQ)
sage: for c,t in Q: print c,t
1 z
5 1