What a fascinating hypothetical universe! Let's dive into the journey of the laser pulse as it approaches the massive black hole.

**Initial Conditions**

The laser pulse is emitted from a region of very weak gravity, where the speed of light is relatively low. We'll call this initial speed $c_0$. The frequency of the laser pulse is $\nu_0$, and its wavelength is $\lambda_0 = c_0 / \nu_0$. The pulse is directed towards the massive black hole, which is situated in a region of extremely strong gravity.

**Journey Begins**

As the laser pulse travels through space, it enters regions with increasingly stronger gravitational fields. According to the hypothetical universe's rules, the speed of light is proportional to the local gravitational field strength. This means that the speed of the laser pulse, $c$, will increase as it approaches the black hole.

**Gravitational Redshift**

As the laser pulse enters the stronger gravitational field, its frequency will decrease due to gravitational redshift. This is because the stronger gravity will cause time to pass more slowly near the black hole, which in turn causes the frequency of the pulse to decrease. The frequency of the pulse, $\nu$, will be reduced to $\nu' = \nu_0 \sqrt{1 - \frac{2GM}{rc^2}}$, where $G$ is the gravitational constant, $M$ is the mass of the black hole, and $r$ is the distance from the black hole.

**Increase in Speed**

As the laser pulse approaches the black hole, the gravitational field strength increases, causing the speed of light to increase. The speed of the pulse, $c$, will become $c' = c_0 \sqrt{1 + \frac{2GM}{rc^2}}$. This increase in speed is a result of the stronger gravity, which effectively "boosts" the speed of the pulse.

**Trajectory Changes**

The increasing gravity will also cause the trajectory of the laser pulse to bend, following the curvature of spacetime. The pulse will be attracted towards the black hole, and its path will become more curved as it approaches the event horizon. This bending of the trajectory is a result of the gravitational lensing effect, which is more pronounced near massive objects like black holes.

**Approaching the Event Horizon**

As the laser pulse approaches the event horizon, the point of no return around a black hole, its speed will increase dramatically. The gravitational field strength becomes so strong that the speed of light approaches infinity, $c \to \infty$. However, this is a theoretical limit, as the event horizon marks the boundary beyond which nothing, including light, can escape.

**Crossing the Event Horizon**

If the laser pulse were to cross the event horizon, it would effectively be trapped by the black hole. The speed of the pulse would continue to increase, but it would no longer be able to escape the black hole's gravity. The pulse would be absorbed by the black hole, and its energy would be added to the black hole's mass.

**Observational Effects**

From the perspective of a distant observer, the laser pulse would appear to slow down as it approaches the event horizon, due to the effects of gravitational time dilation. The pulse would also appear to be shifted towards the red end of the spectrum, due to the gravitational redshift. However, these effects would become more pronounced as the pulse approaches the event horizon, making it increasingly difficult to observe.

In conclusion, the journey of the laser pulse towards the massive black hole would be a complex and fascinating phenomenon. The pulse's speed, frequency, and trajectory would all change as it approaches the black hole, due to the effects of gravitational redshift, gravitational lensing, and the increasing strength of the gravitational field. Ultimately, the pulse would be trapped by the black hole, and its energy would be absorbed, if it were to cross the event horizon.