How to attack a two time pad if the plain text is randomized?

As an extension to this quesiton, or this one how would you go about attacking a re used pad if the plaintext was randomized before being encrypted?

  0 0 0 1...         Plaintext

0 1 1 1            seed(truly random number)
0 1 0 1            Key1
0 0 1 0            seed + Key1 mod 2 (=Cipher1)

0 1 1 0...         Plaintext + PRNG(seed) mod 2 (=CipherR)
1 0 1 0...         Key2(repeating 2 bit key "1 0")
1 1 0 0...         CipherR + Key2 mod 2 (=Cipher2)

0 0 1 0 1 1 0 0... Cipher1 & Cipher2 → ciphertext


This is using a OTP cipher to transmit the seed of a PRNG, then using a Vernam cipher with a repeating key to transmit the plaintext XORed with the PRN. Increasing the message length a little, hopefully to avoid cribbing.

How do you decode the Vernam cipher after the plain text has been randomized?

If your PRNG is good and your seed unknown $C_R = pt \oplus PRNG(seed)$ is essentially already an encryption of the plaintext using a stream cipher constructed from a PRNG.
Therefore $K_2 \oplus C_R$ can be viewed as an encryption of $K_2$. This is not useful but it also doesn't help an attacker.