First thing is the payment for training and I do not see any point against an employer paying this as whatsoever.
Second thing is what this is for the employers financial department, tax authorities and your wallet. This part is none of your business, as long as it is not called salary, in which case you may be eligible to pay income tax on benefit in money's worth.
Third thing I see a benefit for your work and an argument to have this declared further education. Depending on the tax clerk, this may hold or not, as it is an education "also suitable to be used for leisure". Probability is high you get through tax audit as part of business expenditure, if paid by the employer and labelled education. Probability is very low, if you try to pay yourself and later deduct from tax. CPL is different.
Forth thing is after obtaining the license and real flying afterwards. The field "what if" flying PPL in the grey areas of a commercial environment is a huge and in the end unresolved issue for many shades of the deed. Cost sharing is only one small issue in a complex framework of questions, like in which aircraft and when do you need an AOC - all unsolved issues and really, really, really juridical complicated.