Firstly I seriously doubt there is anyone in this country that has the depth of knowledge too really help you.
Guppy genetic's is very complex and even harder if you don't know what you are starting with.
Please note I have a 3.5 metre room dedicated to creating guppy strains, my focus right now is on pink mutation guppies eg The Panda guppy XpinkXpink
Ymoscow Xpink
The Pink Mutation has a red inhibiting and a delta tail inhibiting Gene.
Also you must be very careful not to introduce yellow colour cells other wise the white platinum will reflect the yellow, I know this as I created a Gold Albino platinum around 2006 from an albino white platinum male and a Green Diamond female ( GD has yellow ).
Now down to your Male....
What is he?????
Starts for 10, getting rid of the red will be very hard for 2 reasons.
1, it is a VERY DOMINANT colour
2, He may well be a full or mostly red fish.
LOOK on top of his head... he's a red head!!!!
I have a very similar fish except he has red fins and my research is pointing in the direction of the fish you have being a poor quality Tai Platinum Pink ( don't worry about me using the word "poor" as we grab what we can.)
So I believe your goal is not possible with out first creating this strain.
To prolong his life keep him cool high teens - low 20's.
The best fish to use is a Blonde red tail.
The female fry will be carry 1 copy of his platinum gene.
When the female fry are 3 months old breed them back to you male, waste the males!
25% of the resulting female fry will carry a double copy of his X Chrom and if your lucky some of the males will look close.
P.s I think this line maybe a magenta!!! ( magenta messes with the colour cells, it will double up the same as the platinum gene), which really complicates things, Oh they may carry a single copy of the albino mutations( they also must be doubled up to be revealed ) as Albino Tai platinum pinks are sold by the Asian commercial breeders === Google