Would PRP, 5% topical minoxidil & Low Laser Light therapy be enough to maintain/thicken hair? (Photos)

This is a commonly asked question. The answer is probably yes , but it depends upon how strong of a genetic inheritance exists. The PRP does act as an antiandrogen, however it needs to be injected more often without the use of Finasteride. I would also suggest oral Minoxidil at a dose of 2.5 to5 mg.. Pumpkin seed oil and ketoconazole shampoo should be added to the regimen. Close monitoring with a Computerized hair camera, such as Hairmetrix, will allow your Dermatologist to determine if changes need to be made to the protocol.
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While no can predict the outcome in someone with MPD/androgenetic alopecia with 100% certainty, it is very likely that if you use multiple therapies tp prevent hair loss at this early stage, you'll be successful in warding off significant hair loss going forward. Each of PRP, minoxidil, and low level laser therapy - on their own - have good efficacy in at least maintaining existing hair. In combination, that efficacy is even greater. By using different therapies with differing mechanisms of action, you are "covering your bases".
Improvement is more likely in some areas than others. Medical therapies can restore miniaturized hair, but they will not regrow follicles that have completely died. Furthermore, hair is the crown is more amenable to regrowth than the hairline. With combination therapy, you have a greater than 50% chance of seeing some degree of improvement in the crown. You may see some thickening of the existing hairline, but medical therapy is unlikely to restore your hairline to its previous shape.
Given your age and stage, I would recommend starting with at least one year of combination medical therapy before considering a hair transplant. You may never need one.

You just to give it time minoxdil is one of the longest studies medications for male pattern balding currently topical is fda approved twice a day. I have seen decent results with low light laser therapy and some devices do have fda clearance so give it anywhere 6 months to a 1 year.

Answering your questions in more detail. Different factor play a role in androgenic hair loss such as genetic predisposition (linked to chromosome X from your mother), stress, environment and diet to mentions the most important. Taking care of your hair loss at easy age can delay the hair loss process. If you want to avoid finasteride, there are alternatives like the ones that you mention. Example topical minoxidil, PRP and LED therapy. Also other good alternatives off label are topical dutasteride. Studies are showing good results and is something to keep an eye.